Carboxylate substituted pyrazine: A simple and low-cost building block for novel wide bandgap polymer donor enables 15.3% efficiency in organic solar cells
Artikel i vetenskaplig tidskrift, 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


Carboxylate substituted pyrazine

Organic solar cells


Jingnan Wu

Soochow University

Qunping Fan

Soochow University

Chalmers, Kemi och kemiteknik, Tillämpad kemi

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, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

Harald Ade

North Carolina State University

Maojie Zhang

Soochow University

Nano Energy

2211-2855 (ISSN)

Vol. 82 105679







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