Cyclohexylammonium-Based 2D/3D Perovskite Heterojunction with Funnel-Like Energy Band Alignment for Efficient Solar Cells (23.91%)

Seonghwa Jeong, Seongrok Seo, Hyunwoo Yang, Hyoungmin Park, Sooeun Shin, Hyungju Ahn, Donghwa Lee, Jong Hyeok Park, Nam Gyu Park, Hyunjung Shin

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

Insufficient charge extraction at the interfaces between light-absorbing perovskites and charge transporting layers is one of the drawbacks of state-of-the-art perovskite solar cells. Surface treatments and/or interface engineering are necessary to approach the Shockley–Queisser limit. In this work, novel 2D layered perovskites, such as CHA2PbI4 (CHAI = cyclohexylammonium iodide) and CHMA2PbI4 (CHMAI = cyclohexylmethylammonium iodide), are introduced in between 3D perovskites and hole transporting layers by a simple solution process and the 2D/3D perovskite heterojunction is formed and confirmed. Spontaneous photoluminescence quenching is observed by efficient hole extraction with a favorable valence band alignment. The charge extraction ability and recombination are directly measured by the transient photocurrent and photovoltage. Moreover, the interface resistance of the devices significantly is decreased to 30% as compared to devices without 2D perovskites. As a result, the devices with 2D/3D perovskite heterojunction exhibit improved power conversion efficiency (PCE) from 20.41% to 23.91% primarily because of the increased open-circuit voltage (1.079 to 1.143 V) and fill factor (78.22% to 84.25%). The results provide a detailed insight into hole extraction and high PCEs with the formation of a 2D/3D perovskite heterojunction.

Original languageEnglish
Article number2102236
JournalAdvanced Energy Materials
Volume11
Issue number42
DOIs
Publication statusPublished - 2021 Nov 11

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science

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