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Dopant‐Free and Green‐Solvent‐Processable Hole‐Transporting Materials for Highly Efficient Inverted Planar Perovskite Solar Cells
Author(s) -
Meng Fei,
Wang Yunhao,
Wen Yaping,
Lai Xue,
Li Wenhui,
Kyaw Aung Ko Ko,
Zhang Ren,
Fan Dongyu,
Li Yuheng,
Du Mengzhen,
Guo Xiao,
Ma Haibo,
Li Gongqiang,
Sun Xiao Wei,
Wang Jianpu
Publication year - 2020
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000327
Subject(s) - dopant , materials science , planar , energy conversion efficiency , relative humidity , solvent , chemical engineering , nanotechnology , optoelectronics , chemistry , doping , organic chemistry , computer science , physics , engineering , thermodynamics , computer graphics (images)
Two saddle‐shaped hole‐transporting materials (HTMs), α, β‐COTh‐Ph‐OMeTAD and β, β‐COTh‐Ph‐OMeTAD are designed with a strategy of flexible core with tunable conformation (FCTC) and applied in inverted planar perovskite solar cells (PSCs) as dopant‐free HTMs. As a result, the device based on α, β‐COTh‐Ph‐OMeTAD demonstrates a high power conversion efficiency (PCE) of 17.59% with J sc = 21.32 mA cm −2 , V oc = 1.02 V, and FF = 80.75%, and the one based on β, β‐COTh‐Ph‐OMeTAD yields a higher PCE of 18.53% with J sc = 22.68 mA cm −2 , V oc = 1.04 V, and FF = 78.48%. Moreover, the green‐solvent‐processed PSCs are also fabricated by dissolving the HTMs in ethyl acetate. Without any encapsulation, the devices based on both HTMs retain 80% of their initial PCEs after storage for 150 days in a glove box, and 60% of their initial PCEs after storing for 300 h in ambient air with 40% relative humidity. All these results demonstrate that the materials α, β‐COTh‐Ph‐OMeTAD and β, β‐COTh‐Ph‐OMeTAD based on FCTC strategy are promising HTMs for highly efficient and stable PSCs.