Efficient and stable inverted planar perovskite solar cells using a triphenylamine hole-transporting material

Rui Chen, Tongle Bu, Jing Li, Wei Li, Peng Zhou, Xueping Liu, Zhiliang Ku, Jie Zhong, Yong Peng, Fuzhi Huang, Yi Bing Cheng, Zhengyi Fu

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

Abstract

Inverted perovskite solar cells (PSCs) with a p-i-n structure have attracted great attention. Normally, inorganic p-type metal oxides or polymers are used as the hole-transport material (HTM), a vital component in the inverted PSCs. However, this type of HTM often requires high processing temperatures and/or high costs. On the other hand, a commonly used organic HTM, poly(3,4-ethylenedioxythiophene polystyrene sulfonate (PEDOT:PSS), is sensitive to humidity and thus affects the stability of the PSCs. Herein, we employ a small molecule, 4,4′,4′′-tris(N-3-methylphenyl-N-phenylamino) triphenylamine (m-MTDATA) to replace PEDOT:PSS as a new HTM for inverted PSCs. Compared to a PEDOT:PSS-based device, m-MTDATA-based PSCs exhibit enhanced performance. The highest power conversion efficiency (PCE) was notably improved from 13.44 % (PEDOT:PSS) to 18.12 % (m-MTDATA), suggesting that m-MTDATA could be an efficient HTM to achieve high performance inverted PSCs. Furthermore, the m-MTDATA-based device demonstrated improved stability (retaining 90 % PCE) under ambient conditions over 1000 h compared with the PEDOT:PSS-based devices (retaining 40 % PCE).

Original languageEnglish
Pages (from-to)1467-1473
Number of pages7
JournalChemSusChem
Volume11
Issue number9
DOIs
Publication statusPublished - 9 May 2018

Keywords

  • hole-transport material
  • inverted planar structure
  • perovskite
  • solar cells
  • triphenylamine

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