Effect of non-stoichiometric solution chemistry on improving the performance of wide-bandgap perovskite solar cells

Yang, Mengjin; Kim, Dong Hoe; Yu, Yue; Li, Zhen; Reid, Obadiah G.; Song, Zhaoning; Zhao, Dewei; Wang, Changlei; Li, Liwei; Meng, Yuan; Guo, Ted; Yan, Yanfa; Zhu, Kai

doi:10.1016/j.mtener.2017.10.001

Title: Effect of non-stoichiometric solution chemistry on improving the performance of wide-bandgap perovskite solar cells

Journal Article · Mon Oct 02 00:00:00 EDT 2017 · Materials Today Energy

DOI:https://doi.org/10.1016/j.mtener.2017.10.001· OSTI ID:1427344

Yang, Mengjin ^[1]; Kim, Dong Hoe ^[1];

^[2]; Li, Zhen ^[1]; Reid, Obadiah G. ^[1];

^[2]; Zhao, Dewei ^[2]; Wang, Changlei ^[2]; Li, Liwei ^[3]; Meng, Yuan ^[3]; Guo, Ted ^[3];

^[2]; Zhu, Kai ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Toledo, OH (United States)
ENN Energy Research Inst., Langfang (China); ENN Solar Energy Co., Ltd., Langfang (China)

A high-efficiency wide-bandgap (WBG) perovskite solar cell is critical for developing perovskite-related (e.g., all-perovskite, perovskite/Si, or perovskite/Cu(In,Ga)Se₂) tandem devices. Here, we demonstrate the use of non-stoichiometric precursor chemistry with excess methylammonium halides (MAX; X = I, Br, or Cl) for preparing high-quality ~1.75-eV FA_0.83Cs_0.17Pb(I_0.6Br_0.4)₃ perovskite solar cells. Among various methylammonium halides, using excess MABr in the non-stoichiometric precursor exhibits the strongest effect on improving perovskite crystallographic properties and device characteristics without affecting the perovskite composition. In contrast, using excess MAI significantly reduces the bandgap of perovskite due to the replacement of Br with I. Using 40% excess MABr, we demonstrate a single-junction WBG perovskite solar cell with stabilized efficiency of 16.4%. We further demonstrate a 20.3%-efficient 4-terminal tandem device by using a 14.7%-efficient semi-transparent WBG perovskite top cell and an 18.6%-efficient unfiltered (5.6%-efficient filtered) Si bottom cell.

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Research Organization:: National Renewable Energy Lab. (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308; FOA-0000990

OSTI ID:: 1427344

Alternate ID(s):: OSTI ID: 1549394

Report Number(s):: NREL/JA-5900-70019; TRN: US1802855

Journal Information:: Materials Today Energy, Vol. 7, Issue C; ISSN 2468-6069

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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Wide-bandgap, low-bandgap, and tandem perovskite solar cells Song, Zhaoning; Chen, Cong; Li, Chongwen Semiconductor Science and Technology, Vol. 34, Issue 9 https://doi.org/10.1088/1361-6641/ab27f7	journal	July 2019
Additive Engineering for Efficient and Stable Perovskite Solar Cells Zhang, Fei; Zhu, Kai Advanced Energy Materials https://doi.org/10.1002/aenm.201902579	journal	October 2019

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