Efficiency Enhancement with the Ferroelectric Coupling Effect Using P(VDF‐TrFE) in CH3NH3PbI3 Solar Cells

A novel ferroelectric coupling photovoltaic effect is reported to enhance the open‐circuit voltage (VOC) and the efficiency of CH3NH3PbI3 perovskite solar cells. A theoretical analysis demonstrates that this ferroelectric coupling effect can effectively promote charge extraction as well as suppress...

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Published inAdvanced science Vol. 6; no. 16; pp. 1900252 - n/a
Main Authors Jia, Endong, Wei, Dong, Cui, Peng, Ji, Jun, Huang, Hao, Jiang, Haoran, Dou, Shangyi, Li, Meicheng, Zhou, Chunlan, Wang, Wenjing
Format Journal Article
LanguageEnglish
Published Hoboken John Wiley and Sons Inc 21.08.2019
Wiley
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Summary:A novel ferroelectric coupling photovoltaic effect is reported to enhance the open‐circuit voltage (VOC) and the efficiency of CH3NH3PbI3 perovskite solar cells. A theoretical analysis demonstrates that this ferroelectric coupling effect can effectively promote charge extraction as well as suppress combination loss for an increased minority carrier lifetime. In this study, a ferroelectric polymer P(VDF‐TrFE) is introduced to the absorber layer in solar cells with a proper cocrystalline process. Piezoresponse force microscopy (PFM) is used to confirm that the P(VDF‐TrFE):CH3NH3PbI3 mixed thin films possess ferroelectricity, while the pure CH3NH3PbI3 films have no obvious PFM response. Additionally, with the applied external bias voltages on the ferroelectric films, the devices begin to show tunable photovoltaic performance, as expected for the polarization in the poling process. Furthermore, it is shown that through the ferroelectric coupled effect, the efficiency of the CH3NH3PbI3‐based perovskite photovoltaic devices is enhanced by about 30%, from 13.4% to 17.3%. And the open‐circuit voltages (VOC) reach 1.17 from 1.08 V, which is reported to be among the highest VOCs for CH3NH3PbI3‐based devices. It should be noted in particular that the thickness of the layer is less than 160 nm, which can be regarded as semi‐transparent. The ferroelectric P(VDF‐TrFE) polymer dopant results in promoting the built‐in electric field in the absorber perovskite layer, which leads to both increasing the minority carrier diffusion length and reducing the nonradiative recombination loss. Compared to typical CH3NH3PbI3‐based perovskite solar cells (PSCs), optimized FE‐PSCs present higher VOCs up to 1.17 V and power conversion efficiency up to 18%.
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ISSN:2198-3844
2198-3844
DOI:10.1002/advs.201900252