Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells

Ma, Ke; Atapattu, Harindi R.; Zhao, Qiuchen; Gao, Yao; Finkenauer, Blake P.; Wang, Kang; Chen, Ke; Park, So Min; Coffey, Aidan H.; Zhu, Chenhui; Huang, Libai; Graham, Kenneth R.; Mei, Jianguo; Dou, Letian

doi:10.1002/adma.202100791

Title: Multifunctional Conjugated Ligand Engineering for Stable and Efficient Perovskite Solar Cells

Journal Article · Mon Jul 05 00:00:00 EDT 2021 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202100791· OSTI ID:1838435

^[1]; Atapattu, Harindi R. ^[2]; Zhao, Qiuchen ^[1]; Gao, Yao ^[1]; Finkenauer, Blake P. ^[1]; Wang, Kang ^[1]; Chen, Ke ^[1]; Park, So Min ^[2]; Coffey, Aidan H. ^[1]; Zhu, Chenhui ^[3]; Huang, Libai ^[1]; Graham, Kenneth R. ^[2]; Mei, Jianguo ^[1]; Dou, Letian ^[1]

Purdue Univ., West Lafayette, IN (United States)
Univ. of Kentucky, Lexington, KY (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Abstract Surface passivation is an effective way to boost the efficiency and stability of perovskite solar cells (PSCs). However, a key challenge faced by most of the passivation strategies is reducing the interface charge recombination without imposing energy barriers to charge extraction. Here, a novel multifunctional semiconducting organic ammonium cationic interface modifier inserted between the light‐harvesting perovskite film and the hole‐transporting layer is reported. It is shown that the conjugated cations can directly extract holes from perovskite efficiently, and simultaneously reduce interface non‐radiative recombination. Together with improved energy level alignment and the stabilized interface in the device, a triple‐cation mixed‐halide medium‐bandgap PSC with an excellent power conversion efficiency of 22.06% (improved from 19.94%) and suppressed ion migration and halide phase segregation, which lead to a long‐term operational stability, is demonstrated. This strategy provides a new practical method of interface engineering in PSCs toward improved efficiency and stability.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences; US Department of the Navy, Office of Naval Research (ONR); USDOE

Grant/Contract Number:: AC02-05CH11231; N00014-19-1; SC0016356; DE‐SC0016356; DE‐SC0018208

OSTI ID:: 1838435

Alternate ID(s):: OSTI ID: 1805097

Journal Information:: Advanced Materials, Vol. 33, Issue 32; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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