Premium
Hole‐Transport Materials Containing Triphenylamine Donors with a Spiro[fluorene‐9,9′‐xanthene] Core for Efficient and Stable Large Area Perovskite Solar Cells
Author(s) -
Wu Guohua,
Zhang Yaohong,
Kaneko Ryuji,
Kojima Yoshiyuki,
Sugawa Kosuke,
Chowdhury Towhid H.,
Islam Ashraful,
Shen Qing,
Akhtaruzzaman Md.,
Noda Takeshi,
Otsuki Joe
Publication year - 2017
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.201700096
Subject(s) - triphenylamine , xanthene , perovskite (structure) , materials science , fluorene , energy conversion efficiency , optoelectronics , perovskite solar cell , open circuit voltage , photochemistry , voltage , chemistry , crystallography , polymer , electrical engineering , composite material , engineering
Three low‐cost triphenylamine‐based hole‐transport materials (HTMs) with spiro[fluorene‐9,9‐xanthene] (SFX) skeleton are synthesized through a facile three‐step procedure. The effect of the chemical structure of the HTMs on the optical property, energy levels, H 2 O/HTM interface, as well as the perovskite solar cell performance are studied. With the increasing bulkiness of attached groups on the SFX skeleton, the charge recombination resistance at the TiO 2 /perovskite/HTMs interfaces is gradually increased, leading to increased open‐circuit voltages. The device based on the bulkiest HTM (named BTPA‐6) exhibits a better solar cell performance (11.57%, area: 1.02 cm 2 ) than those with BTPA‐4 and BTPA‐5 in the forward scan. BTPA‐6 also exhibits a power conversion efficiency of 14.4% (area: 0.375 cm 2 ) which nearly matches spiro‐OMeTAD (15.0%) in the reverse scan. Furthermore, all the three cost‐effective (∼1/3 of that of spiro‐OMeTAD) HTMs exhibit better long‐term stabilities than spiro‐OMeTAD.