Reduced Open-Circuit Voltage Loss of Perovskite Solar Cells via Forming p/p+ Homojunction and Interface Electric Field on the Surfaces of Perovskite Film

Jiankai Zhang; Yapeng Sun; Chengwen HuangBo YuHuangzhong Yu

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Reduced Open-Circuit Voltage Loss of Perovskite Solar Cells via Forming p/p+ Homojunction and Interface Electric Field on the Surfaces of Perovskite Film

机译：Reduced Open-Circuit Voltage Loss of Perovskite Solar Cells via Forming p/p+ Homojunction and Interface Electric Field on the Surfaces of Perovskite Film

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The severe nonradiative recombination losses limit the further improvementof open-circuit voltage (V_(oc)) and power conversion efficiency (PCE) ofperovskite solar cells (PVSCs). In this work, the 4,4′-cyclohexylidenebis[N,N-bis(4-methylphenyl) benzene amine] is dissolved into the antisolventto prepare perovskite films, which reduces defects, improves thecrystallinity, and induces a p/p+ homojunction on the top surface ofperovskite film. Besides, the 2-thiophenemethylammonium iodide and2-thiophenethylammonium iodide form interface electric field and passivatedefects on the bottom surface of perovskite film. The p/p+ homojunction andinterface electric field enhance the charges’ separation and transportationefficiencies in the bulk perovskite film and at the perovskite/charge transportlayer interfaces, which effectively reduces nonradiative recombinationlosses and V_(oc) loss of PVSCs. Consequently, low V_(oc) loss of 0.348 V is realized,resulting in the increase in Voc from 1.082 to 1.172 V and PCE from19.15% to23.44%. The optimized PVSCs without encapsulation maintain 88.23% of theoriginal PCE after exposing in the air for 1500 h. This work provides a strategyto reduce the nonradiative recombination losses and V_(oc) loss by forming p/p+homojunction and interface electric field on the surfaces of perovskite film,which advances the development of high-performance PVSCs.

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来源
《Advanced energy materials》 |2022年第47期|2202542.1-2202542.13|共13页
作者
Jiankai Zhang; Yapeng Sun; Chengwen HuangBo YuHuangzhong Yu;
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School of Physics and OptoelectronicsSouth China University of TechnologyGuangzhou, Guangdong 510640, P. R. China;

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正文语种英语
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homojunctions; interface electric field; nonradiative recombination; perovskite solar cells; V_(oc) loss;

Reduced Open-Circuit Voltage Loss of Perovskite Solar Cells via Forming p/p+ Homojunction and Interface Electric Field on the Surfaces of Perovskite Film

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