Dopant-Free Hole-Transporting Materials for Stable and Efficient Perovskite Solar Cells

Sanghyun Paek; Peng Qin; Yonghui Lee; Kyung Taek Cho; Peng Gao; Giulia Grancini; Emad Oveisi; Paul Gratia; Kasparas Rakstys; Shaheen A Al-Muhtaseb; Christian Ludwig; Jaejung Ko; Mohammad Khaja Nazeeruddin

doi:10.1002/adma.201606555

Dopant-Free Hole-Transporting Materials for Stable and Efficient Perovskite Solar Cells

Adv Mater. 2017 Sep;29(35). doi: 10.1002/adma.201606555. Epub 2017 Jul 17.

Authors

Affiliations

¹ Group for Molecular Engineering of Functional Materials, École Polytechnique Fédérale de Lausanne, CH-1951, Sion, Switzerland.
² ENAC IIE GR-LUD, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
³ Interdisciplinary Centre for Electron Microscopy, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.
⁴ Department of Chemical Engineering, Qatar University, P.O. Box 2713, Doha, Qatar.
⁵ Department of New Material Chemistry, Korea University, Jochiwon, Chungnam, 339-700, South Korea.

PMID: 28714259
DOI: 10.1002/adma.201606555

Abstract

Molecularly engineered novel dopant-free hole-transporting materials for perovskite solar cells (PSCs) combined with mixed-perovskite (FAPbI₃ )_0.85 (MAPbBr₃ )_0.15 (MA: CH₃ NH₃⁺ , FA: NH=CHNH₃⁺ ) that exhibit an excellent power conversion efficiency of 18.9% under AM 1.5 conditions are investigated. The mobilities of FA-CN, and TPA-CN are determined to be 1.2 × 10^-4 cm² V^-1 s^-1 and 1.1 × 10^-4 cm² V^-1 s^-1 , respectively. Exceptional stability up to 500 h is measured with the PSC based on FA-CN. Additionally, it is found that the maximum power output collected after 1300 h remained 65% of its initial value. This opens up new avenue for efficient and stable PSCs exploring new materials as alternatives to Spiro-OMeTAD.

Keywords: dopant-free; hole-transport materials; perovskite solar cells; photovoltaic; stability.