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Illumination‐Induced Hole Doping for Performance Improvement of Graphene/n‐Silicon Solar Cells with P3HT Interlayer
Author(s) -
Xu Dikai,
He Jian,
Yu Xuegong,
Gao Dace,
Ma Lingling,
Mu Xinhui,
Zhong Mengyao,
Xu Yang,
Ye Jichun,
Xu Mingsheng,
Yang Deren
Publication year - 2017
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201600516
Subject(s) - materials science , optoelectronics , graphene , doping , energy conversion efficiency , schottky barrier , photovoltaic system , silicon , work function , hybrid solar cell , layer (electronics) , nanotechnology , polymer solar cell , electrical engineering , engineering , diode
Graphene/silicon (Gr/Si) solar cells have triggered considerable interest for their potential in low‐cost and high‐efficiency photovoltaic applications. However, the performance of Gr/Si solar cells is still limited by poor Gr conductivity and carrier recombination at the interface. In this study, a solution‐processable poly(3‐hexylthiophene‐2,5‐diyl) (P3HT) thin film is employed as a carrier selective interlayer in the graphene and n‐type Si solar cells, which can increase the work function and conductivity of the Gr due to photoinduced p‐type doping under light illumination. Consequently, the Schottky barrier height of the solar cells is enhanced, whereas the carrier recombination at the interface is suppressed. The utilization of antireflection and additional chemical doping at the other side of the Gr layer further improves the performance of the solar cells, which shows a power conversion efficiency of 12.95% with high stability. This study paves a new venue for the development of Gr/Si solar cells toward real applications.