Composition‐Conditioning Agent for Doped Spiro‐OMeTAD to Realize Highly Efficient and Stable Perovskite Solar Cells

Yang, Heyi; Shen, Yunxiu; Zhang, Rui; Wu, Yeyong; Chen, Weijie; Yang, Fu; Cheng, Qinrong; Chen, Haiyang; Ou, Xuemei; Yang, Haidi; Gao, Feng; Li, Yaowen; Li, Yongfang

doi:10.1002/aenm.202202207

Composition‐Conditioning Agent for Doped Spiro‐OMeTAD to Realize Highly Efficient and Stable Perovskite Solar Cells

Journal Article · 23 September 2022 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.202202207· OSTI ID:2422654

Yang, Heyi ^[1]; Shen, Yunxiu ^[1]; Zhang, Rui ^[2]; Wu, Yeyong ^[1]; Chen, Weijie ^[1]; Yang, Fu ^[1]; Cheng, Qinrong ^[1]; Chen, Haiyang ^[1]; Ou, Xuemei ^[1]; Yang, Haidi ^[1]; Gao, Feng ^[2]; ^[3]; Li, Yongfang ^[4]

Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor‐optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China
Department of Physics Chemistry and Biology (IFM) Linköping University 58183 Linköping Sweden
Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor‐optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China; Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou 215123 P. R. China; State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China
Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor‐optoelectronics Materials and Devices College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China; Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow University Suzhou 215123 P. R. China; Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China

Abstract

The doped Spiro‐OMeTAD hole transport layer (HTL) formed using the lithium bis(trifluoromethane) sulfonimide salt and 4‐tert‐butylpyridine with phenethylammonium iodide surface treatment on a perovskite film has continuously dominated the record power conversion efficiencies (PCEs) of perovskite solar cells (pero‐SCs). However, unstable HTL compositions and iodide salts can cause severe device degradation. In this study, an HTL composition‐conditioning agent (CCA), Spiro‐BD‐2OEG, is designed, which contains a Spiro‐OMeTAD‐like backbone, functional pyridine units, and oligo (ethylene glycol) chains. This finely designed CCA presents good miscibility with Spiro‐OMeTAD and its dopants and acts as a conditioning agent through weak bond interactions. As a result, the CCA‐regulated HTL shows a pinhole‐free and smooth morphology with enhanced Spiro‐OMeTAD ordering and improves dopant stability. In addition, the gradient‐distributed CCA in the HTL can narrow the energy level offset with the valence band of the perovskite. The resultant pero‐SCs exhibit an excellent PCE of 24.19% without any interface treatment and weak size dependence. A remarkable PCE of 22.63% is obtained even for a 1.004‐cm²device. Importantly, the strategy shows good universality and significantly promotes the long‐term stability of the pero‐SCs based on the classical doped Spiro‐OMeTAD.

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC02-05CH11231

OSTI ID:: 2422654

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 44 Vol. 12; ISSN 1614-6832

Publisher:: Wiley

Country of Publication:: United States

Language:: English

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