TY - JOUR
T1 - Bis[di(4-methoxyphenyl)amino]carbazole-capped indacenodithiophenes as hole transport materials for highly efficient perovskite solar cells
T2 - The pronounced positioning effect of a donor group on the cell performance
AU - Hua, Yong
AU - Chen, Song
AU - Zhang, Dongyang
AU - Xu, Peng
AU - Sun, Anxin
AU - Ou, Yangmei
AU - Wu, Tai
AU - Sun, Hanwen
AU - Cui, Bo
AU - Zhu, Xunjin
N1 - Funding Information:
We acknowledge the High-Level Talents Foundation of Yunnan University (KL180015) and the Science and Engineering Foundation of Yunnan University (KC1710160). X. Z. acknowledges the Hong Kong Research Grants Council (HKBU 22304115), the Hong Kong Baptist University (FRG2/17-18/068 and FRG2/16-17/ 024) and the Areas of Excellence Scheme, University Grants Committee, Hong Kong SAR ([AoE/P-03/08]) for nancial support.
PY - 2019/5/7
Y1 - 2019/5/7
N2 - Bis[di(4-methoxyphenyl)amino]carbazole-capped indacenodithiophenes (IDTs) have been constructed as hole transport materials (HTMs) for perovskite solar cells (PSCs). Two IDT-based HTMs, one with 3,6-bis[di(4-methoxyphenyl)amino]carbazole (YK1) and another with 2,7-bis[di(4-methoxyphenyl)amino]carbazole (YK2), show different performances in PSCs. The PSC device based on YK1 displays a very impressive PCE of 20.13% under AM1.5G solar illumination, which is much higher than those of the devices based on YK2 (17.35%) and Spiro-OMeTAD (19.01%) under the same working conditions. This is mainly because YK1 has more effective intermolecular π-π stacking, a lower-lying HOMO level and higher hole-mobility than YK2 and Spiro-OMeTAD. Furthermore, the YK1-based PSC exhibits excellent long-term stability retaining 94% of the initial PCE value after a 600 h lifetime without encapsulation owing to its better film morphology and hydrophobicity. These findings would shed light on the crucial importance of molecular engineering and allow its extension into general principles for the design of new HTMs for highly efficient and stable PSCs.
AB - Bis[di(4-methoxyphenyl)amino]carbazole-capped indacenodithiophenes (IDTs) have been constructed as hole transport materials (HTMs) for perovskite solar cells (PSCs). Two IDT-based HTMs, one with 3,6-bis[di(4-methoxyphenyl)amino]carbazole (YK1) and another with 2,7-bis[di(4-methoxyphenyl)amino]carbazole (YK2), show different performances in PSCs. The PSC device based on YK1 displays a very impressive PCE of 20.13% under AM1.5G solar illumination, which is much higher than those of the devices based on YK2 (17.35%) and Spiro-OMeTAD (19.01%) under the same working conditions. This is mainly because YK1 has more effective intermolecular π-π stacking, a lower-lying HOMO level and higher hole-mobility than YK2 and Spiro-OMeTAD. Furthermore, the YK1-based PSC exhibits excellent long-term stability retaining 94% of the initial PCE value after a 600 h lifetime without encapsulation owing to its better film morphology and hydrophobicity. These findings would shed light on the crucial importance of molecular engineering and allow its extension into general principles for the design of new HTMs for highly efficient and stable PSCs.
UR - http://www.scopus.com/inward/record.url?scp=85064975406&partnerID=8YFLogxK
U2 - 10.1039/c9ta01731c
DO - 10.1039/c9ta01731c
M3 - Journal article
AN - SCOPUS:85064975406
SN - 2050-7488
VL - 7
SP - 10200
EP - 10205
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 17
ER -
