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Carboxylate substituted pyrazine: A simple and low-cost building block for novel wide bandgap polymer donor enables 15.3% efficiency in organic solar cells.
- Source :
- Nano Energy; Apr2021, Vol. 82, pN.PAG-N.PAG, 1p
- Publication Year :
- 2021
-
Abstract
- 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<superscript>−</superscript><superscript>3</superscript> cm<superscript>2</superscript> V<superscript>−</superscript><superscript>1</superscript> s<superscript>−1</superscript>. 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. [Display omitted] • A novel wide bandgap polymer donor PFBCPZ was synthesized. • The novel building block (DTCPz) showed easily synthesized routs with cheap raw material. • The OSC based on PFBCPZ:IT-4F exhibited excellent performance with 15.3% efficiency. • The efficiency is the highest value in the IT-4F-based binary OSCs so far. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22112855
- Volume :
- 82
- Database :
- Supplemental Index
- Journal :
- Nano Energy
- Publication Type :
- Academic Journal
- Accession number :
- 149436555
- Full Text :
- https://doi.org/10.1016/j.nanoen.2020.105679