Improving the photovoltaic performance of inverted perovskite solar cells via manipulating the molecular packing structure of PCBM

Shou-En Chiang; Pei-Chen Lin; Jia-Ren Wu; Sheng Hsiung Chang

doi:10.1088/1361-6528/ac962b

Improving the photovoltaic performance of inverted perovskite solar cells via manipulating the molecular packing structure of PCBM

Nanotechnology. 2022 Oct 17;34(1). doi: 10.1088/1361-6528/ac962b.

Authors

Shou-En Chiang^{1

2

3}, Pei-Chen Lin¹, Jia-Ren Wu^{1

2

3}, Sheng Hsiung Chang^{1

2

3}

Affiliations

¹ Department of Physics, Chung Yuan Christian University, Taoyuan 320314, Taiwan, ROC.
² Research Center for Semiconductor Materials and Advanced Optics, Chung Yuan Christian University, Taoyuan 320314, Taiwan, ROC.
³ R&D Center for Membrane Technology and Center for Nanotechnology, Chung Yuan Christian University, Taoyuan 320314, Taiwan, ROC.

PMID: 36174453
DOI: 10.1088/1361-6528/ac962b

Abstract

In this study, the molecular packing structure of solution-processed phenyl-C61-butyric acid methyl ester (PCBM) thin film was manipulated by varying the volume ratio of chlorobenzene (CB) to bromobenzene (BrB) from 100:0 to 50:50, which largely influences the device performance of the PCBM/perovskite heterojunction solar cells. Absorbance spectra, photoluminescence spectra, atomic force microscopic images and contact angle images were used to investigate the molecular packing structure effects of the PCBM thin films on the device performance of the inverted perovskite solar cells. Our experimental results show that the formation of PCBM aggregates and the contact quality at the PCBM/perovksite interface significantly influence the open-circuit voltage, short-circuit current density and fill factor of the resultant solar cells simultaneously. It is noted that the PCE of the encapsulated inverted CH₃NH₃PbI₃(MAPbI₃) solar cells exhibited a stable and high power conversion efficiency of 18%.

Keywords: CB:BrB solvent mixture; PCBM nano-aggregates; perovskite solar cells; solubility effects.