Carboxylate substituted pyrazine: A simple and low-cost building block for novel wide bandgap polymer donor enables 15.3% efficiency in organic solar cells
Journal article, 2021
In addition to high power conversion efficiency (PCE) and good stability, the low-cost of photovoltaic materials is also very important for the practical application of organic solar cells (OSCs). Herein, we synthesized a carboxylate substituted pyrazine-based electron-deficient building block (DTCPz) with a simple structure and low synthetic cost, and then developed a novel wide bandgap polymer donor PFBCPZ. Due to the synergistic electron-withdrawing effects of the fluorination in donor unit (BDT-TF) and esterification and C=N double-bond in DTCPz unit, PFBCPZ shows a deeper HOMO level of −5.60 eV, a strong intermolecular π-π interaction, good crystallinity and stacking, and high hole-mobility of 2.11 × 10−3 cm2 V−1 s−1. Matched with a low bandgap acceptor IT-4F, excellent charge transfer, weak recombination, and small non-radiative energy loss in OSCs was achieved, resulting in an impressive fill factor of 0.785 and a high open-circuit voltage of 0.92 V. As a result, a PCE of up to 15.3% is obtained in OSCs, which is the highest value in the IT-4F-based binary OSCs so far and indicates that low-cost DTCPz with a simple structure is a promising building block to construct high-performance polymer donors for application in efficient OSCs.
Power conversion efficiency
Wide bandgap polymer donor
Low-cost
Carboxylate substituted pyrazine
Organic solar cells
Author
Jingnan Wu
Soochow University
Qunping Fan
Soochow University
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Minghai Xiong
Soochow University
Qiutang Wang
Xi'an Jiaotong University
Kai Chen
Xi'an Jiaotong University
Haiqin Liu
Donghua University
Mengyuan Gao
Tianjin University
Long Ye
North Carolina State University
Tianjin University
Xia Guo
Soochow University
Jin Fang
Soochow University
Qing Guo
Soochow University
Wenyan Su
Z. F. Ma
Donghua University
Z. Tang
Donghua University
Ergang Wang
Chalmers, Chemistry and Chemical Engineering, Applied Chemistry
Harald Ade
North Carolina State University
Maojie Zhang
Soochow University
Nano Energy
2211-2855 (ISSN)
Vol. 82 105679Subject Categories
Polymer Chemistry
Construction Management
Materials Chemistry
DOI
10.1016/j.nanoen.2020.105679