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Papers by Thanh Kieu Trinh

Japanese Journal of Applied Physics, 2018

This study examined the effects of heat treatment, the electron transport layer, and [6,6]-phenyl... more This study examined the effects of heat treatment, the electron transport layer, and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) incorporation on the performance of hybrid bulk heterojunction (BHJ) solar cells composed of tin disulfide (SnS 2) nanoparticles (NPs) and low band gap energy polymers poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b$]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) or poly({4,8bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b$]dithiophene-2,6-diyl}{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}) (PBT7). Inserting an electron transport layer (ETL) (i.e., ZnO) on the top of the photoactive layer improved the surface morphology of the photoactive layer, which led to an improvement in charge transport. Moreover, adding a suitable amount of PCBM to the SnS 2 /polymer active layer enhanced the device performance, such as short circuit current density (J sc) and power conversion efficiency (PCE). In particular, adding 0.5 mg of PCBM to the composite solution led to a 25% and 1.5% improvement in the J sc value and PCE, respectively. The enhanced performance was due mainly to the improvements in the surface morphology of the photoactive layer, charge carrier mobility within the donor-acceptor interface, and carrier collection efficiency at the cathode.

Journal of Materials Science: Materials in Electronics, 2019

Carbon-coated iron pyrite (FeS 2 @C) was prepared by a green and simple method. The utilization o... more Carbon-coated iron pyrite (FeS 2 @C) was prepared by a green and simple method. The utilization of an amorphous carbonshell layer formed from a glucose source coated on the surface of core-pyrite nanoparticles. The FeS 2 @C thin film was formed by coating synthesized iron pyrite nanoparticles with a carbon layer and depositing the carbon-coated iron pyrite on a fluorine-doped tin oxide (FTO) substrate by spin-coating. The morphological, structural, and chemical composition properties of FeS 2 @C film was measured and characterized. Devices with the structure of FTO/TiO 2 /redox electrolyte/ counter electrodes (FeS 2 @C, pristine FeS 2 , and Pt)/FTO were fabricated. The power conversion efficiency (PCE) of the FeS 2 @C-device (PCE ~ 6.94%), the pristine FeS 2-device (PCE ~ 5.69%), the Pt-device (PCE ~ 6.48%). The improving of the device performance indicated that the FeS 2 @C thin film can be a good counter electrode (CE) for the performance of dye-sensitized solar cells (DSSCs).

Korean Journal of Chemical Engineering, 2018

Iron pyrite (FeS 2) thin films were fabricated by spin coating the solution of FeS 2 nanocrystal... more Iron pyrite (FeS 2) thin films were fabricated by spin coating the solution of FeS 2 nanocrystals of ~40 nm in size on glass substrates, followed by annealing in a sulfur environment at different temperatures. The effect of sulfurization temperature on the morphology, structural, optical and electrical properties was investigated. With increase of the sulfurization temperature, the grain size and crystallinity of the films was improved, although some cracks and voids were observed on the surface of thin films. The band gap of the FeS 2 films was decreased at higher sulfurization temperature. The electrical properties were also changed, including the increasing in resistivity and the decrease in Hall mobility, with increase of sulfurization temperature. The change in the optical and electrical properties of the FeS 2 thin films was explained based on the changes of phase, morphology, surface, and grain boundary property.

Japanese Journal of Applied Physics, 2017

Conventional vacuum deposition process of aluminum (Al) is costly, time-consuming and difficult t... more Conventional vacuum deposition process of aluminum (Al) is costly, time-consuming and difficult to apply to the large-scale production of organic photovoltaic devices (OPV). This paper reports a vacuum-free fabrication process of poly[[4,8-bis(2-ethylhexyl)oxy]benzo[1,2-b: 4,5-b$]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thienophenediyl]:[6,6]-phenyl C71 butyric acid methyl ester (PTB7:PCBM) bulk heterojunction organic solar cell with liquid eutectic gallium-indium (EGaIn) electrode as an alternative to the common Al electrode. The insertion of a thin poly(ethylene oxide) (PEO) layer after depositing organic photoactive layer could help prevent the diffusion of liquid EGaIn into the active layer and allow the deposition of the EGaIn electrode. The PEO interfacial layer was formed by spin-coating from a mixed solvent of alcohol and water. Among different alcohol+water (methanol, ethanol, ethylene glycol, n-propanol, isopropanol, and isobutanol) mixed solvent tested, the n-propanol+water mixed solvent showed the greatest enhancement to the performance of OPVs. The improved device performance was attributed to the reactivity of mixed solvent n-propanol+water toward the surface of PTB7:PCBM active layer, which could help optimize surface morphology.

Journal of Crystal Growth, 2017

Pure phases of cubic and spherical FeS 2 nanocrystals (NCs) with the mean size of 80 nm and 30 nm... more Pure phases of cubic and spherical FeS 2 nanocrystals (NCs) with the mean size of 80 nm and 30 nm, respectively, were obtained using trioctylamine and oleylamine as the solvents to dissolve the sulfur source via a facile and efficient hot injection method. The pure phase formation and shape control were strongly dependent on the concentration of active sulfur source (H 2 S) that could be formed by the reaction between the elemental sulfur and a primary amine. The chemically active sulfur source could facilitate the formation of a pure FeS 2 phase from a FeS phase via a Fe 3 S 4 phase. In addition, the active sulfur concentration is believed to be the main factor to drive the orientation attachment to obtain different shapes of FeS 2 NCs. The obtained FeS 2 pyrite NCs with excellent phase purity and good optical properties are believed to have potential applications to various energy devices including low-cost photovoltaics.

Science of Advanced Materials, 2016

Korean Journal of Chemical Engineering, 2017

Korean Journal of Chemical Engineering, 2015

Abstract-Improvement of the surface roughness and power conversion efficiency (PCE) of bulk heter... more Abstract-Improvement of the surface roughness and power conversion efficiency (PCE) of bulk hetero-junction (BHJ) solar cells was made by the addition of organic additives for the cells based on a low energy-gap polymer, poly [2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta [2,1-b;3,4-b'] dithiophene)-alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT), as an electron donor and [6,6]-phenyl C61 butyric acid methyl ester (PC61BM) as the electron acceptor. The PCPDTBT: PC61BM active layers were prepared by spin-coating process from four different organic solvents: pure chlorobenzene, chlorobenzene with 2.5 vol% 1,2-ethanedithiol (EDT) additive, chlorobenzene with 2.5 vol% 1,8-octanedithiol (ODT) additive, and chlorobenzene with a combination of 2.5 vol% EDT and 2.5 vol% ODT additives. The smoothest surface of the active layer, which was observed by AFM, was obtained in the case of PCPDTBT:PC61BM prepared with a combination of EDT and ODT additives in chlorobenzene, and a maximum PCE of 3.5% was achieved.