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Efficient and stable inverted polymer solar cells prepared via air exposure
Author(s) -
Xiong Jian,
He Zhen,
Yang Bingchu,
Yang Junliang,
Cai Ping,
Xue Xiaogang,
Zhang Jian
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201600580
Subject(s) - materials science , energy conversion efficiency , work function , polymer solar cell , optoelectronics , fabrication , layer (electronics) , active layer , heterojunction , polymer , nanotechnology , chemical engineering , composite material , medicine , alternative medicine , pathology , engineering , thin film transistor
The performance of the inverted polymer solar cells (PSCs) were examined with solution‐processed TiO 2 nanoparticles (TiO 2 NPs) as electron transport layer (ETL) and vapor deposited MoO 3 as hole transport layer (HTL). The performance of the inverted PSCs based on P3HT:PCBM heterojunction was closely depend on the thickness of interface layer. The high power conversion efficiency (PCE) of 3.90% was achieved when the thickness of MoO 3 is 5 nm. The interesting thing is that the PCE of these kinds of inverted PSCs were dramatically enhance after exposing them in air. The increase of the Ag work function, the reduction of MoO 3 film work function, and the enlarged P3HT:PCBM grain size are deduced to the main reasons for the improvement of the devices’ performance. The very high PCE of 4.51% was achieved after the device was exposed in air for 144 h. In addition, we also measured the stability of this kind of devices in air for 1008 h. The devices show excellent stability and the PCE of the devices could maintain about 4.0% after 1008 h exposure. The results provide a new facile method for fabrication of highly efficient and stable inverted PSCs.