Foo Shini - Academia.edu (original) (raw)

Papers by Foo Shini

Research paper thumbnail of Interfacial passivation with 4-chlorobenzene sulfonyl chloride for stable and efficient planar perovskite solar cells

Journal of Materials Chemistry C

A 4-chlorobenzene sulfonyl chloride (CBSC) passivated perovskite solar cell device shows a high-p... more A 4-chlorobenzene sulfonyl chloride (CBSC) passivated perovskite solar cell device shows a high-power conversion efficiency (PCE) of 20.02% with improved long-term stability.

Research paper thumbnail of Enhanced Thermal Stability of Planar Perovskite Solar Cells Through Triphenylphosphine Interface Passivation

ChemSusChem, 2022

While extensive research has driven the rapid efficiency trajectory noted to date for organic-ino... more While extensive research has driven the rapid efficiency trajectory noted to date for organic-inorganic perovskite solar cells (PSCs), their thermal stability remains one of the key issues hindering their commercialization. Herein, we show that by introducing triphenylphosphine (TPP), an effective Lewis base passivator, to the vulnerable perovskite/spiro-OMeTAD interface, a significant reduction in surface defects - a precursor to perovskite instability, can be attained. Not only does TPP passivation enable high power conversion efficiency (PCE) of 20.22% to be achieved, these devices also exhibit superior ambient and thermal stability. Unlike the pristine devices, which exhibits a sharp descend to 16% of its initial PCE on storing in relative humidity (RH) of 10%, at 85 ºC for more than 720 hours, the TPP passivated devices retains 71% of its initial PCE. Hence, this study presents a facile yet excellent approach to attain high-performing yet thermally stable PSCs.

Research paper thumbnail of Marigold flower like structured Cu2NiSnS4 electrode for high energy asymmetric solid state supercapacitors

Scientific Reports, 2020

The growth in energy devices and the role of supercapacitors are increasingly important in today’... more The growth in energy devices and the role of supercapacitors are increasingly important in today’s world. Designing an electrode material for supercapacitors using metals that have high performance, superior structure, are eco-friendly, inexpensive and highly abundant is essentially required for commercialization. In this point of view, quaternary chalcogenide Cu2NiSnS4 with fascinating marigold flower like microstructured electrodes are synthesized using different concentrations of citric acid (0, 0.05 M, 0.1 M and 0.2 M) by employing solvothermal method. The electrode materials physicochemical characteristics are deliberated in detail using the basic characterization techniques. The electrochemical studies revealed better electrochemical performances, in particular, Cu2NiSnS4@0.1 M-CA electrode revealed high 1029 F/g specific capacitance at 0.5 A/g current density. Further, it retained 78.65% capacity over 5000 cycles. To prove the practical applicability, a full-cell asymmetric s...

Research paper thumbnail of Solution-processed Ga-TiO2 electron transport layer for efficient inverted organic solar cells

Materials Letters, 2020

Abstract To boost the charge transport and collection processes in inverted organic solar device,... more Abstract To boost the charge transport and collection processes in inverted organic solar device, gallium (Ga) was added to conventional TiO2 film to form the Ga-TiO2 film. Compared to the pristine film, the Ga-TiO2 film showed better energy level alignment, which is in good agreement with the heightened open-circuit voltage and fill factor. Attributed to the superior electron transport, the Ga-TiO2 based solar cell achieved paramount power conversion efficiency (PCE) of 7.72%, while the pristine TiO2 based solar cell showed lower PCE of 6.65%.

Research paper thumbnail of Highly stable and efficient planar perovskite solar cells using ternary metal oxide electron transport layers

Journal of Power Sources, 2019

In planar perovskite solar cells, the electron transport layer (ETL) plays a vital role in effect... more In planar perovskite solar cells, the electron transport layer (ETL) plays a vital role in effective extraction and transportation of photogenerated electrons from the perovskite layer to the cathode. Ternary metal oxides exhibit excellent potentials as ETLs since their electrical and optical properties are attunable through simple compositional adjustments. In this paper, we demonstrate the use of solution-processed zinc oxide (ZnO) and zinc tin oxide (ZTO) films as highly efficient ETLs for perovskite solar cells. We observe poor compatibility between ZnO and perovskite which impedes device reproducibility, stability, and performance unlike ZTO ETL devices. Furthermore, we modify the ZTO/perovskite interface by introducing a thin passivating SnO 2 interlayer. The Zn 1 Sn 1 O x /SnO 2 ETL device demonstrates paramount power conversion efficiency (PCE) of 19.01% with corresponding short circuit current density (J sc), open circuit voltage (V oc), and fill factor (FF) values of 21.93 mA cm À 2 , 1.10 V, and 78.82%. Moreover, the Zn 1 Sn 1 O x /SnO 2 ETL device displays superior stability, maintaining 90% of its initial PCE after 90 days in the absence of encapsulation at relative humidity of 30-40%. Enhancement in charge extraction, favourable energy alignment, and reduction in recombination sites greatly contribute to the optimal performance, stability, and reproducibility of the Zn 1 Sn 1 O x /SnO 2 ETL device.

Research paper thumbnail of Heterogeneous electron transporting layer for reproducible, efficient and stable planar perovskite solar cells

Journal of Power Sources, 2019

Abstract Organometal-halide perovskites continue to attract a large number of solar enthusiasts d... more Abstract Organometal-halide perovskites continue to attract a large number of solar enthusiasts due to their intrinsic properties as promising solar absorbers with relatively low processing cost. However, commercialization of perovskite solar cells remains distant, especially in the planar perovskite configuration, because of various problems such as inconsistency, poor environmental stability, and small-scale production. In this study, we present the use of complimentary electron transporting layers (ETLs) as a highly effective approach to cover the weaknesses of individual ETLs while boosting the strengths of various ETL compositions. Heterogeneous AITO/SnO2 ETL based device demonstrates paramount efficiency of 18.90% and exhibits superior stability maintaining 93% of its initial efficiency after 25 days in the absence of encapsulation at relative humidity of 30–40%. Furthermore, the simple addition of a consistent AITO layer allows improvement in reproducibility, while the simple addition of a SnO2 layer exhibits significant enhancement in electron mobility and reduction in recombination sites at the AITO/perovskite interface. In essence, our results suggest the use of compatible heterogeneous ETLs as an appealing method to provide synergistic enhancements in various photovoltaic parameters, device stability, and also device reproducibility of planar perovskite devices.

Research paper thumbnail of Effect of doped TiO2 film as electron transport layer for inverted organic solar cell

Materials Science for Energy Technologies

Nanocrystalline TiO 2 and Sn-doped TiO 2 thin films were prepared by sol-gel spin coating method.... more Nanocrystalline TiO 2 and Sn-doped TiO 2 thin films were prepared by sol-gel spin coating method. The crystallinity and anatase phase of TiO 2 and Sn-doped TiO 2 were confirmed from X-ray diffraction analysis. The EDAX analysis also confirmed the presence of tin, oxygen and titania elements. By fabricating an inverted organic solar cell with device configuration of ITO/Sn-doped TiO 2 /active layer/MoO 3 /Al, power conversion efficiency (PCE) of the Sn-doped TiO 2 was observed to be 3.08% compared to the TiO 2 based solar cell of 2.64%.

Research paper thumbnail of Interfacial passivation with 4-chlorobenzene sulfonyl chloride for stable and efficient planar perovskite solar cells

Journal of Materials Chemistry C

A 4-chlorobenzene sulfonyl chloride (CBSC) passivated perovskite solar cell device shows a high-p... more A 4-chlorobenzene sulfonyl chloride (CBSC) passivated perovskite solar cell device shows a high-power conversion efficiency (PCE) of 20.02% with improved long-term stability.

Research paper thumbnail of Enhanced Thermal Stability of Planar Perovskite Solar Cells Through Triphenylphosphine Interface Passivation

ChemSusChem, 2022

While extensive research has driven the rapid efficiency trajectory noted to date for organic-ino... more While extensive research has driven the rapid efficiency trajectory noted to date for organic-inorganic perovskite solar cells (PSCs), their thermal stability remains one of the key issues hindering their commercialization. Herein, we show that by introducing triphenylphosphine (TPP), an effective Lewis base passivator, to the vulnerable perovskite/spiro-OMeTAD interface, a significant reduction in surface defects - a precursor to perovskite instability, can be attained. Not only does TPP passivation enable high power conversion efficiency (PCE) of 20.22% to be achieved, these devices also exhibit superior ambient and thermal stability. Unlike the pristine devices, which exhibits a sharp descend to 16% of its initial PCE on storing in relative humidity (RH) of 10%, at 85 ºC for more than 720 hours, the TPP passivated devices retains 71% of its initial PCE. Hence, this study presents a facile yet excellent approach to attain high-performing yet thermally stable PSCs.

Research paper thumbnail of Marigold flower like structured Cu2NiSnS4 electrode for high energy asymmetric solid state supercapacitors

Scientific Reports, 2020

The growth in energy devices and the role of supercapacitors are increasingly important in today’... more The growth in energy devices and the role of supercapacitors are increasingly important in today’s world. Designing an electrode material for supercapacitors using metals that have high performance, superior structure, are eco-friendly, inexpensive and highly abundant is essentially required for commercialization. In this point of view, quaternary chalcogenide Cu2NiSnS4 with fascinating marigold flower like microstructured electrodes are synthesized using different concentrations of citric acid (0, 0.05 M, 0.1 M and 0.2 M) by employing solvothermal method. The electrode materials physicochemical characteristics are deliberated in detail using the basic characterization techniques. The electrochemical studies revealed better electrochemical performances, in particular, Cu2NiSnS4@0.1 M-CA electrode revealed high 1029 F/g specific capacitance at 0.5 A/g current density. Further, it retained 78.65% capacity over 5000 cycles. To prove the practical applicability, a full-cell asymmetric s...

Research paper thumbnail of Solution-processed Ga-TiO2 electron transport layer for efficient inverted organic solar cells

Materials Letters, 2020

Abstract To boost the charge transport and collection processes in inverted organic solar device,... more Abstract To boost the charge transport and collection processes in inverted organic solar device, gallium (Ga) was added to conventional TiO2 film to form the Ga-TiO2 film. Compared to the pristine film, the Ga-TiO2 film showed better energy level alignment, which is in good agreement with the heightened open-circuit voltage and fill factor. Attributed to the superior electron transport, the Ga-TiO2 based solar cell achieved paramount power conversion efficiency (PCE) of 7.72%, while the pristine TiO2 based solar cell showed lower PCE of 6.65%.

Research paper thumbnail of Highly stable and efficient planar perovskite solar cells using ternary metal oxide electron transport layers

Journal of Power Sources, 2019

In planar perovskite solar cells, the electron transport layer (ETL) plays a vital role in effect... more In planar perovskite solar cells, the electron transport layer (ETL) plays a vital role in effective extraction and transportation of photogenerated electrons from the perovskite layer to the cathode. Ternary metal oxides exhibit excellent potentials as ETLs since their electrical and optical properties are attunable through simple compositional adjustments. In this paper, we demonstrate the use of solution-processed zinc oxide (ZnO) and zinc tin oxide (ZTO) films as highly efficient ETLs for perovskite solar cells. We observe poor compatibility between ZnO and perovskite which impedes device reproducibility, stability, and performance unlike ZTO ETL devices. Furthermore, we modify the ZTO/perovskite interface by introducing a thin passivating SnO 2 interlayer. The Zn 1 Sn 1 O x /SnO 2 ETL device demonstrates paramount power conversion efficiency (PCE) of 19.01% with corresponding short circuit current density (J sc), open circuit voltage (V oc), and fill factor (FF) values of 21.93 mA cm À 2 , 1.10 V, and 78.82%. Moreover, the Zn 1 Sn 1 O x /SnO 2 ETL device displays superior stability, maintaining 90% of its initial PCE after 90 days in the absence of encapsulation at relative humidity of 30-40%. Enhancement in charge extraction, favourable energy alignment, and reduction in recombination sites greatly contribute to the optimal performance, stability, and reproducibility of the Zn 1 Sn 1 O x /SnO 2 ETL device.

Research paper thumbnail of Heterogeneous electron transporting layer for reproducible, efficient and stable planar perovskite solar cells

Journal of Power Sources, 2019

Abstract Organometal-halide perovskites continue to attract a large number of solar enthusiasts d... more Abstract Organometal-halide perovskites continue to attract a large number of solar enthusiasts due to their intrinsic properties as promising solar absorbers with relatively low processing cost. However, commercialization of perovskite solar cells remains distant, especially in the planar perovskite configuration, because of various problems such as inconsistency, poor environmental stability, and small-scale production. In this study, we present the use of complimentary electron transporting layers (ETLs) as a highly effective approach to cover the weaknesses of individual ETLs while boosting the strengths of various ETL compositions. Heterogeneous AITO/SnO2 ETL based device demonstrates paramount efficiency of 18.90% and exhibits superior stability maintaining 93% of its initial efficiency after 25 days in the absence of encapsulation at relative humidity of 30–40%. Furthermore, the simple addition of a consistent AITO layer allows improvement in reproducibility, while the simple addition of a SnO2 layer exhibits significant enhancement in electron mobility and reduction in recombination sites at the AITO/perovskite interface. In essence, our results suggest the use of compatible heterogeneous ETLs as an appealing method to provide synergistic enhancements in various photovoltaic parameters, device stability, and also device reproducibility of planar perovskite devices.

Research paper thumbnail of Effect of doped TiO2 film as electron transport layer for inverted organic solar cell

Materials Science for Energy Technologies

Nanocrystalline TiO 2 and Sn-doped TiO 2 thin films were prepared by sol-gel spin coating method.... more Nanocrystalline TiO 2 and Sn-doped TiO 2 thin films were prepared by sol-gel spin coating method. The crystallinity and anatase phase of TiO 2 and Sn-doped TiO 2 were confirmed from X-ray diffraction analysis. The EDAX analysis also confirmed the presence of tin, oxygen and titania elements. By fabricating an inverted organic solar cell with device configuration of ITO/Sn-doped TiO 2 /active layer/MoO 3 /Al, power conversion efficiency (PCE) of the Sn-doped TiO 2 was observed to be 3.08% compared to the TiO 2 based solar cell of 2.64%.