Zhitao Shen | Henan University (original) (raw)
Papers by Zhitao Shen
ACS Applied Materials & Interfaces
Journal of Materials Chemistry C
The M-QDs and OAI synergistic co-passivated perovskite film displays the reduction of defect dens... more The M-QDs and OAI synergistic co-passivated perovskite film displays the reduction of defect density and charge recombination, leading to an excellent performance PSC with a high PCE of 22.01%, a large Voc of 1.20 V and remarkable stability.
Communications Physics
Efficient, stable and low-cost solar cells are being desired for the photovoltaic conversion of s... more Efficient, stable and low-cost solar cells are being desired for the photovoltaic conversion of solar energy into electricity for sustainable energy production. Nanorod/nanowire arrays of narrow-bandgap semiconductors are the promising light-harvesters for photovoltaics because of their excellent optoelectrical properties. Here, the array of preferentially oriented antimony trisulfide (Sb2S3) single-crystalline nanorods is grown on polycrystalline titania (TiO2) film by a tiny-seed-assisted solution-processing strategy, offering an Sb2S3/TiO2 nanoarray heterojunction system on a large scale. It is demonstrated that the Sb2S3 nanorod growth follows a tiny-seed-governed orientation-competing-epitaxial nucleation/growth mechanism. Using a conjugated polymer hole transporting layer on the heterojunction, we achieve a power conversion efficiency of 5.70% in the stable hybrid solar cell with a preferred p-type/intrinsic/n-type architecture featuring effectively straightforward charge tran...
Physical Chemistry Chemical Physics, 2021
Quantum dynamics and ring polymer molecular dynamics calculations reveal interesting dynamical an... more Quantum dynamics and ring polymer molecular dynamics calculations reveal interesting dynamical and kinetic behaviors of an endothermic complex-forming reaction.
International Journal of Minerals, Metallurgy and Materials, 2022
An excellent organolead halide perovskite film is important for the good performance of perovskit... more An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells (PSCs). However, defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells. To solve this problem, this study incorporated a complex of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 into the CH 3 NH 3 PbI 3 active layer. The effects of different doping concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 on the performance and stability of PSCs were analyzed. Results showed that doping appropriate incorporation concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 in CH 3 NH 3 PbI 3 can improve the performance of the prepared solar cells. In specific, CdS and Cd(SCN 2 H 4 ) 2 Cl 2 can effectively passivate the defects in perovskite crystals, thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO 2 /perovskite interface. Due to the reduction of perovskite crystal defects and the enhancement of compactness of the CdS:Cd(SCN 2 H 4 ) 2 Cl 2 :CH 3 NH 3 PbI 3 composite film, the stability of PSCs is significantly improved.
ACS Applied Materials & Interfaces, 2022
2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-OMeTAD),... more 2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-OMeTAD), the most widely used hole transport material in high-efficiency perovskite solar cells (PSCs), still has serious defects, such as moisture absorption and poor long-term conductivity, which seriously restrict further improvement of the power conversion efficiency (PCE) and stability of the cell. Herein, to overcome these problems, inorganic salt PbSO4(PbO)4 quantum dots (QDs) are incorporated into spiro-OMeTAD as the hole transport layer (HTL) for the first time. The incorporated PbSO4(PbO)4 QDs significantly hinder the agglomeration of lithium bis(trifluoromethanesulfonyl)-imide and improve the long-term conductivity through the oxidative interaction between PbSO4(PbO)4 QDs and spiro-OMeTAD and hydrophobicity of the HTL. Furthermore, the spiro-OMeTAD:PbSO4(PbO)4 composite film can effectively passivate perovskite defects at the perovskite/HTL interface, resulting in suppressed interfacial recombination. As a result, the PSC based on the spiro-OMeTAD:PbSO4(PbO)4 HTL shows an improved PCE of 22.66%, which is much higher than that (18.89%) of the control device. PbSO4(PbO)4 also significantly improves the moisture stability for 50 days at room temperature (at RH ∼ 40-50%) without encapsulation. This work indicates that inorganic PbSO4(PbO)4 QDs are crucial materials that can be employed as an additive in spiro-OMeTAD to enhance the efficiency and stability of PSCs.
The Journal of Physical Chemistry C, 2020
High photoelectronic response with broad spectral range in photoelectric materials is of the grea... more High photoelectronic response with broad spectral range in photoelectric materials is of the great importance for the photovoltaics and photocatalysis applications. However, the existing photoelect...
ACS Applied Energy Materials, 2021
Advanced Functional Materials, 2020
The electron transport layer (ETL) has an important influence on the power conversion efficiency ... more The electron transport layer (ETL) has an important influence on the power conversion efficiency (PCE) and stability of n-i-p planar perovskite solar cells (PSCs). This paper presents an N-type semiconductor material, (CH 3) 2 Sn(COOH) 2 (abbreviated as CSCO) that is synthesized and prepared for the first time as an ETL for n-i-p planar PSCs, which leads to a high PCE of 22.21% after KCl treatment, one of the highest PCEs of n-i-p planar PSCs to date. Further analysis reveals that the high PCE is attributed to the excellent conductivity of CSCO because of its more delocalized electron cloud distribution due to its unique −O=C−O− group, and to the defect passivation of the Cs 0.05 (FA 0.85 MA 0.15) 0.95 Pb(I 0.85 Br 0.15) 3 (denoted as CsFAMA) perovskite through the interaction between the O (Sn) atoms of CSCO and the Pb (halogen) atoms of CsFAMA at CSCO/CsFAMA interface, while the traditional ETL materials such as SnO 2 film lack this function. In addition to the high PCE, the optimal PSCs using CSCO as ETL show remarkable stability, retaining over 83% of its initial PCE without encapsulation after 130 days of storage in ambient conditions (≈25 °C at ≈40% humidity), much better than the traditional SnO 2-based n-i-p PSCs.
Advanced Functional Materials, 2020
Charge recombination due to interfacial defects is an important source of loss in perovskite sola... more Charge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two-sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene-based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO 2 side of the electron-extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCApassivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA-containing cells retain 96% of initial efficiency following 50 h of UV-filtered MPP testing.
Chemistry of Materials, 2021
The Journal of Physical Chemistry C, 2021
ACS Applied Energy Materials, 2021
Designing efficient and economical dye-sensitized solar cells (DSSCs) free of precious metals is ... more Designing efficient and economical dye-sensitized solar cells (DSSCs) free of precious metals is required to replace the platinum counter electrode (Pt CE) for further large-scale development. Here...
EcoMat, 2021
Hole transport layer (HTL) is very important for the power conversion efficiency (PCE) and stabil... more Hole transport layer (HTL) is very important for the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). As current state-of-the-art HTL, Li-TFSI doped spiro-OMeTAD often suffers low conductivity and the hydrolysis of the additive Li-TFSI, which significantly hinders the further improvement of PCE of PSCs. Besides, conventional spiro-OMeTAD has no functional of directly passivating the perovskite crystal defects. Herein, multifunctional TiO 2 nanoparticles (NPs)-modified CNT (CNT:TiO 2) doped spiro-OMeTAD (spiro-OMeTAD+CNT:TiO 2) HTL is reported for the first time. The incorporated CNT:TiO 2 not only significantly increases the conductivity of spiro-OMeTAD+CNT:TiO 2 , but also effectively passivates the crystal defects of perovskite layer. The optimized PSCs with spiro-OMeTAD+CNT:TiO 2 HTL achieved a peak PCE of 21.53%, much higher than that (17.90%) of the conventional spiro-OMeTAD based PSCs and also show significantly improved stability.
Physical Chemistry Chemical Physics, 2017
Vibrational autoionization of Rydberg states provides key information about nonadiabatic processe... more Vibrational autoionization of Rydberg states provides key information about nonadiabatic processes above an ionization threshold.
Nano Energy, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
ACS Applied Materials & Interfaces
Journal of Materials Chemistry C
The M-QDs and OAI synergistic co-passivated perovskite film displays the reduction of defect dens... more The M-QDs and OAI synergistic co-passivated perovskite film displays the reduction of defect density and charge recombination, leading to an excellent performance PSC with a high PCE of 22.01%, a large Voc of 1.20 V and remarkable stability.
Communications Physics
Efficient, stable and low-cost solar cells are being desired for the photovoltaic conversion of s... more Efficient, stable and low-cost solar cells are being desired for the photovoltaic conversion of solar energy into electricity for sustainable energy production. Nanorod/nanowire arrays of narrow-bandgap semiconductors are the promising light-harvesters for photovoltaics because of their excellent optoelectrical properties. Here, the array of preferentially oriented antimony trisulfide (Sb2S3) single-crystalline nanorods is grown on polycrystalline titania (TiO2) film by a tiny-seed-assisted solution-processing strategy, offering an Sb2S3/TiO2 nanoarray heterojunction system on a large scale. It is demonstrated that the Sb2S3 nanorod growth follows a tiny-seed-governed orientation-competing-epitaxial nucleation/growth mechanism. Using a conjugated polymer hole transporting layer on the heterojunction, we achieve a power conversion efficiency of 5.70% in the stable hybrid solar cell with a preferred p-type/intrinsic/n-type architecture featuring effectively straightforward charge tran...
Physical Chemistry Chemical Physics, 2021
Quantum dynamics and ring polymer molecular dynamics calculations reveal interesting dynamical an... more Quantum dynamics and ring polymer molecular dynamics calculations reveal interesting dynamical and kinetic behaviors of an endothermic complex-forming reaction.
International Journal of Minerals, Metallurgy and Materials, 2022
An excellent organolead halide perovskite film is important for the good performance of perovskit... more An excellent organolead halide perovskite film is important for the good performance of perovskite solar cells (PSCs). However, defects in perovskite crystals can affect the photovoltaic properties and stability of solar cells. To solve this problem, this study incorporated a complex of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 into the CH 3 NH 3 PbI 3 active layer. The effects of different doping concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 on the performance and stability of PSCs were analyzed. Results showed that doping appropriate incorporation concentrations of CdS and Cd(SCN 2 H 4 ) 2 Cl 2 in CH 3 NH 3 PbI 3 can improve the performance of the prepared solar cells. In specific, CdS and Cd(SCN 2 H 4 ) 2 Cl 2 can effectively passivate the defects in perovskite crystals, thereby suppressing the charge recombination in PSCs and promoting the charge extraction at the TiO 2 /perovskite interface. Due to the reduction of perovskite crystal defects and the enhancement of compactness of the CdS:Cd(SCN 2 H 4 ) 2 Cl 2 :CH 3 NH 3 PbI 3 composite film, the stability of PSCs is significantly improved.
ACS Applied Materials & Interfaces, 2022
2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-OMeTAD),... more 2,2',7,7'-Tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (spiro-OMeTAD), the most widely used hole transport material in high-efficiency perovskite solar cells (PSCs), still has serious defects, such as moisture absorption and poor long-term conductivity, which seriously restrict further improvement of the power conversion efficiency (PCE) and stability of the cell. Herein, to overcome these problems, inorganic salt PbSO4(PbO)4 quantum dots (QDs) are incorporated into spiro-OMeTAD as the hole transport layer (HTL) for the first time. The incorporated PbSO4(PbO)4 QDs significantly hinder the agglomeration of lithium bis(trifluoromethanesulfonyl)-imide and improve the long-term conductivity through the oxidative interaction between PbSO4(PbO)4 QDs and spiro-OMeTAD and hydrophobicity of the HTL. Furthermore, the spiro-OMeTAD:PbSO4(PbO)4 composite film can effectively passivate perovskite defects at the perovskite/HTL interface, resulting in suppressed interfacial recombination. As a result, the PSC based on the spiro-OMeTAD:PbSO4(PbO)4 HTL shows an improved PCE of 22.66%, which is much higher than that (18.89%) of the control device. PbSO4(PbO)4 also significantly improves the moisture stability for 50 days at room temperature (at RH ∼ 40-50%) without encapsulation. This work indicates that inorganic PbSO4(PbO)4 QDs are crucial materials that can be employed as an additive in spiro-OMeTAD to enhance the efficiency and stability of PSCs.
The Journal of Physical Chemistry C, 2020
High photoelectronic response with broad spectral range in photoelectric materials is of the grea... more High photoelectronic response with broad spectral range in photoelectric materials is of the great importance for the photovoltaics and photocatalysis applications. However, the existing photoelect...
ACS Applied Energy Materials, 2021
Advanced Functional Materials, 2020
The electron transport layer (ETL) has an important influence on the power conversion efficiency ... more The electron transport layer (ETL) has an important influence on the power conversion efficiency (PCE) and stability of n-i-p planar perovskite solar cells (PSCs). This paper presents an N-type semiconductor material, (CH 3) 2 Sn(COOH) 2 (abbreviated as CSCO) that is synthesized and prepared for the first time as an ETL for n-i-p planar PSCs, which leads to a high PCE of 22.21% after KCl treatment, one of the highest PCEs of n-i-p planar PSCs to date. Further analysis reveals that the high PCE is attributed to the excellent conductivity of CSCO because of its more delocalized electron cloud distribution due to its unique −O=C−O− group, and to the defect passivation of the Cs 0.05 (FA 0.85 MA 0.15) 0.95 Pb(I 0.85 Br 0.15) 3 (denoted as CsFAMA) perovskite through the interaction between the O (Sn) atoms of CSCO and the Pb (halogen) atoms of CsFAMA at CSCO/CsFAMA interface, while the traditional ETL materials such as SnO 2 film lack this function. In addition to the high PCE, the optimal PSCs using CSCO as ETL show remarkable stability, retaining over 83% of its initial PCE without encapsulation after 130 days of storage in ambient conditions (≈25 °C at ≈40% humidity), much better than the traditional SnO 2-based n-i-p PSCs.
Advanced Functional Materials, 2020
Charge recombination due to interfacial defects is an important source of loss in perovskite sola... more Charge recombination due to interfacial defects is an important source of loss in perovskite solar cells. Here, a two-sided passivation strategy is implemented by incorporating a bilinker molecule, thiophene-based carboxylic acid (TCA), which passivates defects on both the perovskite side and the TiO 2 side of the electron-extracting heterojunction in perovskite solar cells. Density functional theory and ultrafast charge dynamics reveal a 50% reduction in charge recombination at this interface. Perovskite solar cells made using TCApassivated heterojunctions achieve a power conversion efficiency of 21.2% compared to 19.8% for control cells. The TCA-containing cells retain 96% of initial efficiency following 50 h of UV-filtered MPP testing.
Chemistry of Materials, 2021
The Journal of Physical Chemistry C, 2021
ACS Applied Energy Materials, 2021
Designing efficient and economical dye-sensitized solar cells (DSSCs) free of precious metals is ... more Designing efficient and economical dye-sensitized solar cells (DSSCs) free of precious metals is required to replace the platinum counter electrode (Pt CE) for further large-scale development. Here...
EcoMat, 2021
Hole transport layer (HTL) is very important for the power conversion efficiency (PCE) and stabil... more Hole transport layer (HTL) is very important for the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). As current state-of-the-art HTL, Li-TFSI doped spiro-OMeTAD often suffers low conductivity and the hydrolysis of the additive Li-TFSI, which significantly hinders the further improvement of PCE of PSCs. Besides, conventional spiro-OMeTAD has no functional of directly passivating the perovskite crystal defects. Herein, multifunctional TiO 2 nanoparticles (NPs)-modified CNT (CNT:TiO 2) doped spiro-OMeTAD (spiro-OMeTAD+CNT:TiO 2) HTL is reported for the first time. The incorporated CNT:TiO 2 not only significantly increases the conductivity of spiro-OMeTAD+CNT:TiO 2 , but also effectively passivates the crystal defects of perovskite layer. The optimized PSCs with spiro-OMeTAD+CNT:TiO 2 HTL achieved a peak PCE of 21.53%, much higher than that (17.90%) of the conventional spiro-OMeTAD based PSCs and also show significantly improved stability.
Physical Chemistry Chemical Physics, 2017
Vibrational autoionization of Rydberg states provides key information about nonadiabatic processe... more Vibrational autoionization of Rydberg states provides key information about nonadiabatic processes above an ionization threshold.
Nano Energy, 2020
This is a PDF file of an article that has undergone enhancements after acceptance, such as the ad... more This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.