Open AccessMultiple electron transporting layers and their excellent properties based on organic solar cell
Author(s) -
Ziyan Yang,
Ting Zhang,
Jingyu Li,
Wu Xue,
Changfeng Han,
Yuanyuan Cheng,
Qian Liu,
Weiran Cao,
Yixing Yang,
Song Chen
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/s41598-017-08613-7
Subject(s) - materials science , energy conversion efficiency , organic solar cell , polymer solar cell , open circuit voltage , work function , chemical engineering , short circuit , active layer , ternary operation , heterojunction , optoelectronics , layer (electronics) , voltage , nanotechnology , polymer , composite material , computer science , physics , thin film transistor , quantum mechanics , engineering , programming language
To improve the performance of inverted polymer solar cells based on a ternary blend of polymerthieno [3,4-b] thiophene/benzodithiophene (PTB7), [6,6]-phenyl C 71 -butyric acid methyl ester (PC 71 BM) and indene-C60-bisadduct (ICBA), a two-layer structure of zinc oxide (ZnO) and Al-doped zinc oxide (AZO) nanoperticles is used to improve electron extraction. Comparing to ZnO, AZO has lower work function and thus provides larger built-in potential across the organic heterojunction, resulting in more efficient photo-current extraction and larger open circuit voltages. Optimum devices with ZnO/AZO nanoparticles show enhancement of both short circuit current and open circuit voltage, leading to a power conversion efficiency (PCE) of 8.85%. The argument of energy level buffering and surface morphology is discussed in the paper. Finally, using a trilayer electron transporting unit of ZnO/AZO/PFN, the interface dipole between the organic active layer and AZO is introduced. The PCE is further enhanced to 9.17%.