Dopant-Free Hole Transporting Polymers for High Efficiency, Environmentally Stable Perovskite Solar Cells

Hsueh Chung Liao, Teck Lip Dexter Tam, Peijun Guo, Yilei Wu, Eric F. Manley, Wei Huang, Nanjia Zhou, Chan Myae Myae Soe, Binghao Wang, Michael R. Wasielewski, Lin X. Chen, Mercouri G. Kanatzidis, Antonio Facchetti, Robert P.H. Chang, Tobin J. Marks

Research output: Contribution to journalArticle

105 Citations (Scopus)

Abstract

Over the past five years, a rapid progress in organometal-halide perovskite solar cells has greatly influenced emerging solar energy science and technology. In perovksite solar cells, the overlying hole transporting material (HTM) is critical for achieving high power conversion efficiencies (PCEs) and for protecting the air-sensitive perovskite active layer. This study reports the synthesis and implementation of a new polymeric HTM series based on semiconducting 4,8-dithien-2-yl-benzo[1,2-d;4,5-d′]bistriazole-alt-benzo[1,2-b:4,5-b′]dithiophenes (pBBTa-BDTs), yielding high PCEs and environmentally-stable perovskite cells. These intrinsic (dopant-free) HTMs achieve a stabilized PCE of 12.3% in simple planar heterojunction cells—the highest value to date for a polymeric intrinsic HTM. This high performance is attributed to efficient hole extraction/collection (the most efficient pBBTa-BDT is highly ordered and orients π-face-down on the perovskite surface) and balanced electron/hole transport. The smooth, conformal polymer coatings suppress aerobic perovskite film degradation, significantly enhancing the solar cell 85 °C/65% RH PCE stability versus typical molecular HTMs.

Original languageEnglish
Article number1600502
JournalAdvanced Energy Materials
Volume6
Issue number16
DOIs
Publication statusPublished - Aug 24 2016

Keywords

  • carrier mobility
  • perovskite solar cells
  • polymeric hole transporting materials
  • power-conversion-efficiencies

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Liao, H. C., Tam, T. L. D., Guo, P., Wu, Y., Manley, E. F., Huang, W., Zhou, N., Soe, C. M. M., Wang, B., Wasielewski, M. R., Chen, L. X., Kanatzidis, M. G., Facchetti, A., Chang, R. P. H., & Marks, T. J. (2016). Dopant-Free Hole Transporting Polymers for High Efficiency, Environmentally Stable Perovskite Solar Cells. Advanced Energy Materials, 6(16), [1600502]. https://doi.org/10.1002/aenm.201600502