Co-assembled Monolayers as Hole-Selective Contact for High-Performance Inverted Perovskite Solar Cells with Optimized Recombination Loss and Long-Term Stability

Xiang Deng; Feng Qi; Fengzhu Li; Shengfan Wu; Francis R Lin; Zhuomin Zhang; Zhiqiang Guan; Zhengbao Yang; Chun-Sing Lee; Alex K-Y Jen

doi:10.1002/anie.202203088

Co-assembled Monolayers as Hole-Selective Contact for High-Performance Inverted Perovskite Solar Cells with Optimized Recombination Loss and Long-Term Stability

Angew Chem Int Ed Engl. 2022 Jul 25;61(30):e202203088. doi: 10.1002/anie.202203088. Epub 2022 Jun 9.

Authors

Xiang Deng^{1

2

3}, Feng Qi^{1

2

3}, Fengzhu Li^{1

2

3}, Shengfan Wu^{1

3}, Francis R Lin^{2

3}, Zhuomin Zhang⁴, Zhiqiang Guan², Zhengbao Yang⁴, Chun-Sing Lee², Alex K-Y Jen^{1

2

5

3}

Affiliations

¹ Department of Materials Science and Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong.
² Department of Chemistry, City University of Hong Kong, Kowloon, 999077, Hong Kong.
³ Hong Kong Institute for Clean Energy, City University of Hong Kong, Kowloon, 999077, Hong Kong.
⁴ Department of Mechanical Engineering, City University of Hong Kong, Kowloon, 999077, Hong Kong.
⁵ Department of Materials Science & Engineering, University of Washington, Seattle, WA 98195, USA.

PMID: 35560775
DOI: 10.1002/anie.202203088

Abstract

Self-assembled monolayers (SAMs) have been widely employed as an effective way to modify interfaces of electronic/optoelectronic devices. To achieve a good control of the growth and molecular functionality of SAMs, we develop a co-assembled monolayer (co-SAM) for obtaining efficient hole selection and suppressed recombination at the hole-selective interface in inverted perovskite solar cells (PSCs). By engineering the position of methoxy substituents, an aligned energy level and favorable dipole moment can be obtained in our newly synthesized SAM, ((2,7-dimethoxy-9H-carbazol-9-yl) methyl) phosphonic acid (DC-PA). An alkyl ammonium containing SAM is co-assembled to further optimize the surface functionalization and interaction with perovskite layer on top. A champion device with an excellent power conversion efficiency (PCE) of 23.59 % and improved device stability are achieved. This work demonstrates the advantage of using co-SAM in improving performance and stability of PSCs.

Keywords: Hole Selective Layer; Interfaces; Perovskites; Self-Assembled Monolayer; Solar Cells.

Abstract

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