Surface Regulation with Polymerized Small Molecular Acceptor Towards Efficient Inverted Perovskite Solar Cells

Dongyang Li, Yulan Huang, Ruijie Ma, Heng Liu, Qiong Liang, Yu Han, Zhiwei Ren, Kuan Liu, Patrick Wai Keung Fong, Zhuoqiong Zhang, Qing Lian, Xinhui Lu, Chun Cheng, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

29 Citations (Scopus)

Abstract

Optimizing the interface between the perovskite and transport layers is an efficient approach to promote the photovoltaic performance of inverted perovskite solar cells (IPSCs). Given decades of advances in bulk materials optimization, the performance of IPSCs has been pushed to its limits by interface engineering with a power conversion efficiency (PCE) over 25% and excellent stability. Herein, an n-type polymeric semiconducting material, PY-IT, that has shown remarkable performance in organic photovoltaics, is introduced as an interface regulator between perovskite and ETL. Encouragingly, this polymerized small molecular acceptor (PSMA) exhibits significant effectiveness in both passivation defects and electron transfer facilitation properties with the merits of strong planarity and rotatable linkers, which significantly optimizes perovskite grain growth orientation and added charge transport channels. As a result, the PSMA-treated IPSC devices obtain an optimal efficiency of 23.57% with a fill factor of 84%, among the highest efficiency among PSMA-based IPSCs. Meanwhile, the photo-stability of PSMA devices is eye-catching, maintaining ≈80% of its initial PCE after 1000 h of simulated 1-sun illumination under maximal power point tracking. This work combines the achievements of polymer science and IPSC device engineering to provide a new insight into interface regulation of efficient and stable devices.

Original languageEnglish
Article number202204247
Pages (from-to)1-9
JournalAdvanced Energy Materials
DOIs
Publication statusPublished - May 2023

Keywords

  • Inverted perovskite solar cells
  • polymerized small molecules
  • surface reconstruction

ASJC Scopus subject areas

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

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