首页|Enhancing lead-free photovoltaic performance:Minimizing buried surface voids in tin perovskite films through weakly polar solvent pre-treatment strategy

Enhancing lead-free photovoltaic performance:Minimizing buried surface voids in tin perovskite films through weakly polar solvent pre-treatment strategy

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Buried interfacial voids have always been a notorious phenomenon observed in the fabrication of lead perovskite films.The existence of interfacial voids at the buried interface will capture the carrier,sup-press carrier transport efficiencies,and affect the stability of photovoltaic devices.However,the impact of these buried interfacial voids on tin perovskites,a promising avenue for advancing lead-free photo-voltaics,has been largely overlooked.Here,we utilize an innovative weakly polar solvent pre-treatment strategy(WPSPS)to mitigate buried interfacial voids of tin perovskites.Our investigation reveals the presence of numerous voids in tin perovskites during annealing,attributed to trapped dimethyl sulfoxide(DMSO)used in film formation.The WPSPS method facilitates accelerated DMSO evaporation,effectively reducing residual DMSO.Interestingly,the WPSPS shifts the energy level of PEDOT:PSS downward,making it more aligned with the perovskite.This alignment enhances the effi-ciency of charge carrier transport.As the result,tin perovskite film quality is significantly improved,achieving a maximum power conversion efficiency approaching 12％with only an 8.3％efficiency loss after 1700 h of stability tests,which compares well with the state-of-the-art stability of tin-based per-ovskite solar cells.

Tin perovskiteBuried interfacialWeakly polar solvent pre-treatment strategy

Dongdong Yan、Han Zhang、Chensi Gong、Hailong Wang、Qing Lu、Jun Liu、Wenzhen Lv、Mingguang Li、Runfeng Chen、Ligang Xu

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Key Laboratory for Organic Electronics and Information Displays(KLOEID)& Jiangsu Key Laboratory for Biosensors,Institute of Advanced Materials(IAM),Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM),Nanjing University of Posts & Telecommunications,Nanjing 210023,Jiangsu,China

National Institute of Metrology,Beijing 100029,China

School of Pharmacy,North Sichuan Medical College,Nanchong 637100,Sichuan,China

School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology,Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of M

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2024

10.1016/j.jechem.2024.07.024

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.98(11)