Surface-functionalized hole-selective monolayer for high efficiency single-junction wide-bandgap and monolithic tandem perovskite solar cells

Devthade Vidyasagar, Yeonghun Yun, Jae Yu Cho, Hyemin Lee, Kyung Won Kim, Yong Tae Kim, Sung Woong Yang, Jina Jung, Won Chang Choi, Seonu Kim, Rajendra Kumar Gunasekaran, Seok Beom Kang, Kwang Heo, Dong Hoe Kim, Jaeyeong Heo, Sangwook Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Carbazole moiety-based 2PACz ([2-(9H-carbazol-9-yl)ethyl]phosphonic acid) self-assembled monolayers (SAMs) are excellent hole-selective contact (HSC) materials with abilities to excel the charge-transfer-dynamics of perovskite solar cells (PSCs). Herein, we report a facile but powerful method to functionalize the surface of 2PACz-SAM, by which reproducible, highly stable, high-efficiency wide-bandgap PSCs can be obtained. The 2PACz surface treatment with various donor number solvents improves assembly of 2PACz-SAM and leave residual surface-bound solvent molecules on 2PACz-SAM, which increases perovskite grain size, retards halide segregation, and accelerates hole extraction. The surface functionalization achieves a high power conversion efficiency (PCE) of 17.62% for a single-junction wide-bandgap (∼1.77 eV) PSC. We also demonstrate a monolithic all-perovskite tandem solar cell using surface-engineered HSC, showing high PCE of 24.66% with large open-circuit voltage of 2.008 V and high fill-factor of 81.45%. Our results suggest this simple approach can further improve the tandem device, when coupled with a high-performance narrow-bandgap sub-cell.

Original languageEnglish
Pages (from-to)317-326
Number of pages10
JournalJournal of Energy Chemistry
Volume88
DOIs
Publication statusPublished - 2024 Jan

Bibliographical note

Publisher Copyright:
© 2023 Science Press

Keywords

  • 2PACz
  • Monolithic tandem solar cells
  • Perovskite solar cells
  • Wide bandgap

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Electrochemistry

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