Synergic Interface Optimization with Green Solvent Engineering in Mixed Perovskite Solar Cells

Tongle Bu, Lan Wu, Xueping Liu, Xiaokun Yang, Peng Zhou, Xinxin Yu, Tianshi Qin, Jiangjian Shi, Song Wang, Saisai Li, Zhiliang Ku, Yong Peng, Fuzhi Huang, Qingbo Meng, Yi-Bing Cheng, Jie Zhong

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121 Citations (Scopus)

Abstract

Organic-inorganic hybrid halide perovskite solar cells (PSCs) have recently drawn enormous attentions due to their impressive performance (>22%) and low temperature solution processability (<150 °C). Current solution process involves application of a large amount of toxic solvents, such as chlorobenzene, which is heavily employed in both the perovskite layer and the hole transport layer (HTL) deposition. Herein, this study employs green solvent of ethyl acetate for engineering efficient perovskite and HTL layers, which enables a synergic interface (perovskite/HTL) optimization. A champion efficiency of 19.43% is obtained for small cells (0.16 cm2 with mask) and over 14% for large size modules (5 × 5 cm2). The PSCs prepared from the green solvent engineering demonstrate superior performance on both efficiency and stability over their chlorobenzene counterparts. These enhancements are ascribed to the in situ inhibition on carrier recombination induced by interfacial defects during the solution processing, which enables about 2/3 reduction of calculated recombination rate. Thus, the green solvent route shows the great potential toward environmental-friendly manufacturing.

Original languageEnglish
Article number1700576
Number of pages10
JournalAdvanced Energy Materials
Volume7
Issue number20
DOIs
Publication statusPublished - 25 Oct 2017

Keywords

  • Green solvents
  • Interface optimization
  • Large size modules
  • Mixed perovskite
  • Spiro-OMeTAD

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