首页|Graded Heterojunction Improves Wide-Bandgap Perovskite for Highly Efficient 4-Terminal Perovskite/Silicon Tandem Solar Cells

Graded Heterojunction Improves Wide-Bandgap Perovskite for Highly Efficient 4-Terminal Perovskite/Silicon Tandem Solar Cells

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Wide-bandgap(WBG)perovskite solar cells(PSCs)are essential for highly efficient and stable silicon/perovskite tandem solar cells.In this study,we adopted a synthetic strategy with lead thiocyanate(Pb(SCN)2)additive and methylammonium chloride(MACI)posttreatment to enhance the crystallinity and improve the interface of WBG perovskite films with a bandgap of 1.68 eV.The excessive Pbl2 was formed at grain boundaries and converted into MAPbl3-xClx perovskites,which are utilized to form the graded heterojunction(GHJ)and compressive strain.This is beneficial for passivating nonradiative recombination defects,suppressing halide phase segregation,and facilitating carrier extraction.Subsequently,the device with GHJ delivered a champion efficiency of 20.30％and superior stability in ambient air and under 85 ℃.Finally,we achieved a recorded efficiency of 30.91％for 4-terminal WBG perovskite/TOPCon tandem silicon solar cells.Our findings demonstrate a promising approach for fabricating efficient and stable WBG PSCs through the formation of GHJ.

Wenming Chai、Lindong Li、Weidong Zhu、Dazheng Chen、Long Zhou、He Xi、Jincheng Zhang、Chunfu Zhang、Yue Hao

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State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology & Shaanxi Joint Key Laboratory of Graphene,School of Microelectronics,Xidian University,Xi'an,Shaanxi 710071,China

Xi'an Baoxin Solar Technology Co.,Ltd.,Xi'an,710071,China

National Key R&D Program of ChinaNational Key R&D Program of ChinaFundamental Research Funds for the Central UniversitiesNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaYoung Talent Fund of Association for Science and Technology in ShaanxiNatural Science Basic Research Program of Shaanxi

2022YFB36054022021YFF0500501YJSJ2301962274132618041136187408362204189202201152021JC-24

2024

10.34133/research.0196

研究(英文)

研究(英文)

CSTPCD
ISSN：
年,卷(期)：2024.2024(2)
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