Toward high-performance semitransparent perovskite solar cells: interfacial modification and charge extraction perspectives

Yifeng Yao, Shiqi Li, Huixia Xu, Zhixiang Gao, Jingkun Ren, Yanxia Cui, Linfeng Cai, Furong Zhu, Yuying Hao

Research output: Contribution to journalArticlepeer-review

Abstract

Realization of efficient charge extraction at the cathode and anode interfaces is still one of the challenges for improving the power conversion efficiency (PCE) of the semitransparent perovskite solar cells (PSCs). In this work, we report our effort to enhance the PCE of semitransparent PSCs by incorporating a pair of an energetically favorable cathode buffer layer (CBL) and a hole-transporting layer (HTL). The effects of different CBLs, e.g., bathophenanthroline, bathocuproine, and perylene diimide, on charge extraction efficiency and PCE of the semitransparent PSCs are analyzed. Scanning electron microscopy reveals that UV-plasma-treated poly(bis(4-phenyl) (2,4,6-trimethylphenyl) amine) (PTAA) HTL surface favors the growth of a uniform and dense functional CH3NH3(I0.75Br0.15)3 perovskite layer across the substrate, with a low defect density for suppressing charge recombination loss. An average PCE of 13.53% and 9.92% was obtained with combination of a bathocuproine CBL and a PTAA HTL measured from the indium tin oxide (ITO) side and Ag side, respectively. Semitransparent PSCs possess an encouraging large average open-circuit voltage of 1.13 V, and an average transparency of 21%. Achieving an efficient charge collection and retaining a high built-in potential across the CH3NH3(I0.75Br0.15)3 photoactive layer via interfacial modifications are a prerequisite for attaining high-performance semitransparent PSCs.

Original languageEnglish
Article number100833
JournalMaterials Today Energy
Volume21
DOIs
Publication statusPublished - Sep 2021

Scopus Subject Areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science (miscellaneous)
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

User-Defined Keywords

  • Buffer layer
  • Charge collection
  • Interface engineering
  • Semitransparent solar cells

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