Premium
Nitrile‐Substituted QA Derivatives: New Acceptor Materials for Solution‐Processable Organic Bulk Heterojunction Solar Cells
Author(s) -
Zhou Tianlei,
Jia Tao,
Kang Bonan,
Li Fenghong,
Fahlman Mats,
Wang Yue
Publication year - 2011
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100082
Subject(s) - organic solar cell , materials science , acceptor , polymer solar cell , pedot:pss , energy conversion efficiency , homo/lumo , solar cell , band gap , electron acceptor , absorption (acoustics) , photochemistry , hybrid solar cell , molecule , absorption spectroscopy , fullerene , optoelectronics , nanotechnology , polymer , organic chemistry , chemistry , optics , physics , layer (electronics) , composite material , condensed matter physics
The development of non‐fullerene‐based electron acceptors (especially organic molecules with sufficient absorption property within the solar spectrum region) for bulk‐heterojunction (BHJ) organic solar cells (OSCs) is an important issue for the achievement of high photoconversion efficiency. In this contribution, a new class of organic acceptors di‐cyan substituted quinacridone derivatives (DCN‐ n CQA, n = 4, 6 and 8) for BHJ solar cells was designed and synthesized. DCN‐ n CQA molecules possess facile synthesis, solution processability, visible and near‐IR light absorption and relatively stable characteristics. The DCN‐8CQA molecule exhibited a proper LUMO energy level (–4.1 eV), small bandgap (1.8 eV) and moderate electron mobility (10 −4 cm 2 V −1 S −1 ), suggesting that this molecule is an ideal acceptor material for the classical donor material regio‐regular poly (3‐hexylthiophene) (P3HT). A photovoltaic device with a structure of [ITO/PEDOT:PSS/P3HT:DCN‐8CQA/LiF/Al] displayed a power conversion efficiency of 1.57% and a fill factor of 57% under 100 mW cm −2 AM 1.5G simulated solar illumination. The DCN‐ n CQA molecules showed remarkable absorption in the region from 650 to 700 nm, where P3HT has a weak absorption promoting overlap with the solar spectrum and potentially improving the performance of the solar cell.