Influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics

Sheng Hsiung Chang; Kuen Feng Lin; Hsin Ming Cheng; Cheng Chiang Chen; Wen Ti Wu; Wei Nien Chen; Pin Jiun Wu; Sheng Hui Chen; Chun Guey Wu

doi:10.1016/j.solmat.2015.10.045

Influence of organic cations on high-performance CH₃NH₃PbI₃ based photovoltaics

Sheng Hsiung Chang, Kuen Feng Lin, Hsin Ming Cheng, Cheng Chiang Chen, Wen Ti Wu, Wei Nien Chen, Pin Jiun Wu, Sheng Hui Chen, Chun Guey Wu

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

A comprehensive study was carried out to understand the influence of organic cations on high-performance CH₃NH₃PbI₃ based photovoltaics. Scanning electron microscope, X-ray diffractometer, Hall measurement, absorbance spectrum, photoluminescence (PL) spectrum and nanosecond time-resolved PL measurements were used to explore the structural, electrical, optical and excitonic characteristics of CH₃NH₃PbI₃ thin films fabricated under different thermal annealing temperatures from 60 °C to 140 °C. The decrease in the open-circuit voltage (V_OC) with an increase in the thermal annealing temperature can be explained as due to the reduced work function of the CH₃NH₃PbI₃ thin film. The short-circuit current density (J_SC) of the CH₃NH₃PbI₃ based photovoltaics is dependent on the efficiencies of light absorption and carrier collection, which results in an optimized J_SC when the thermal annealing temperature is 120 °C. The atomistic interaction between the organic cations and Pb-I framework strongly influences the absorbance of CH₃NH₃PbI₃ thin films, as confirmed by the libration of CH₃NH₃ cations shown by Raman scattering spectroscopy. In addition, the experimental results indicate that the power conversion efficiency can be further improved when the absorption strength of the CH₃NH₃PbI₃ thin film and the energy-level alignment of each photovoltaic layer are simultaneously fulfilled.

Original language	English
Pages (from-to)	375-381
Number of pages	7
Journal	Solar Energy Materials and Solar Cells
Volume	145
DOIs	https://doi.org/10.1016/j.solmat.2015.10.045
State	Published - 1 Feb 2016

Keywords

Organic cation
Perovskite absorber
Photovoltaics
Raman scattering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.solmat.2015.10.045

Cite this

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title = "Influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics",

abstract = "A comprehensive study was carried out to understand the influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics. Scanning electron microscope, X-ray diffractometer, Hall measurement, absorbance spectrum, photoluminescence (PL) spectrum and nanosecond time-resolved PL measurements were used to explore the structural, electrical, optical and excitonic characteristics of CH3NH3PbI3 thin films fabricated under different thermal annealing temperatures from 60 °C to 140 °C. The decrease in the open-circuit voltage (VOC) with an increase in the thermal annealing temperature can be explained as due to the reduced work function of the CH3NH3PbI3 thin film. The short-circuit current density (JSC) of the CH3NH3PbI3 based photovoltaics is dependent on the efficiencies of light absorption and carrier collection, which results in an optimized JSC when the thermal annealing temperature is 120 °C. The atomistic interaction between the organic cations and Pb-I framework strongly influences the absorbance of CH3NH3PbI3 thin films, as confirmed by the libration of CH3NH3 cations shown by Raman scattering spectroscopy. In addition, the experimental results indicate that the power conversion efficiency can be further improved when the absorption strength of the CH3NH3PbI3 thin film and the energy-level alignment of each photovoltaic layer are simultaneously fulfilled.",

keywords = "Organic cation, Perovskite absorber, Photovoltaics, Raman scattering",

author = "Chang, {Sheng Hsiung} and Lin, {Kuen Feng} and Cheng, {Hsin Ming} and Chen, {Cheng Chiang} and Wu, {Wen Ti} and Chen, {Wei Nien} and Wu, {Pin Jiun} and Chen, {Sheng Hui} and Wu, {Chun Guey}",

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T1 - Influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics

AU - Chang, Sheng Hsiung

AU - Lin, Kuen Feng

AU - Cheng, Hsin Ming

AU - Chen, Cheng Chiang

AU - Wu, Wen Ti

AU - Chen, Wei Nien

AU - Wu, Pin Jiun

AU - Chen, Sheng Hui

AU - Wu, Chun Guey

PY - 2016/2/1

Y1 - 2016/2/1

N2 - A comprehensive study was carried out to understand the influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics. Scanning electron microscope, X-ray diffractometer, Hall measurement, absorbance spectrum, photoluminescence (PL) spectrum and nanosecond time-resolved PL measurements were used to explore the structural, electrical, optical and excitonic characteristics of CH3NH3PbI3 thin films fabricated under different thermal annealing temperatures from 60 °C to 140 °C. The decrease in the open-circuit voltage (VOC) with an increase in the thermal annealing temperature can be explained as due to the reduced work function of the CH3NH3PbI3 thin film. The short-circuit current density (JSC) of the CH3NH3PbI3 based photovoltaics is dependent on the efficiencies of light absorption and carrier collection, which results in an optimized JSC when the thermal annealing temperature is 120 °C. The atomistic interaction between the organic cations and Pb-I framework strongly influences the absorbance of CH3NH3PbI3 thin films, as confirmed by the libration of CH3NH3 cations shown by Raman scattering spectroscopy. In addition, the experimental results indicate that the power conversion efficiency can be further improved when the absorption strength of the CH3NH3PbI3 thin film and the energy-level alignment of each photovoltaic layer are simultaneously fulfilled.

AB - A comprehensive study was carried out to understand the influence of organic cations on high-performance CH3NH3PbI3 based photovoltaics. Scanning electron microscope, X-ray diffractometer, Hall measurement, absorbance spectrum, photoluminescence (PL) spectrum and nanosecond time-resolved PL measurements were used to explore the structural, electrical, optical and excitonic characteristics of CH3NH3PbI3 thin films fabricated under different thermal annealing temperatures from 60 °C to 140 °C. The decrease in the open-circuit voltage (VOC) with an increase in the thermal annealing temperature can be explained as due to the reduced work function of the CH3NH3PbI3 thin film. The short-circuit current density (JSC) of the CH3NH3PbI3 based photovoltaics is dependent on the efficiencies of light absorption and carrier collection, which results in an optimized JSC when the thermal annealing temperature is 120 °C. The atomistic interaction between the organic cations and Pb-I framework strongly influences the absorbance of CH3NH3PbI3 thin films, as confirmed by the libration of CH3NH3 cations shown by Raman scattering spectroscopy. In addition, the experimental results indicate that the power conversion efficiency can be further improved when the absorption strength of the CH3NH3PbI3 thin film and the energy-level alignment of each photovoltaic layer are simultaneously fulfilled.

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KW - Perovskite absorber

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KW - Raman scattering

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