18.6% Efficiency All-Polymer Solar Cells Enabled by a Wide Bandgap Polymer Donor Based on Benzo[1,2-d:4,5-d']bisthiazole

Wu, Peixi; Duan, Yuwei; Li, Yinfeng; Xu, Xiaopeng; Li, Ruipeng; Yu, Liyang; Peng, Qiang

doi:10.1002/adma.202306990

18.6% Efficiency All-Polymer Solar Cells Enabled by a Wide Bandgap Polymer Donor Based on Benzo[1,2-d:4,5-d']bisthiazole

Journal Article · Thu Sep 28 00:00:00 EDT 2023 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202306990· OSTI ID:2440567

Wu, Peixi ^[1]; Duan, Yuwei ^[2]; Li, Yinfeng ^[1]; Xu, Xiaopeng ^[1]; Li, Ruipeng ^[3]; Yu, Liyang ^[1]; ^[1]

Sichuan Univ., Chengdu (China)
Shaanxi Normal University (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)

The limited selection of wide bandgap polymer donors for all-polymer solar cells (all-PSCs) is a bottleneck problem restricting their further development and remains poorly studied. In this work, a new wide bandgap polymer, namely PBBTz-Cl, is designed and synthesized by bridging the benzobisthiazole acceptor block and chlorinated benzodithiophene donor block with thiophene units for application as an electron donor in all-PSCs. PBBTz-Cl not only possesses wide bandgap and deep energy levels but also displays strong absorption, high-planar structure, and good crystallinity, making it a promising candidate for application as a polymer donor in organic solar cells. When paired with the narrow bandgap polymer acceptor PY-IT, a fibril-like morphology forms, which facilitates exciton dissociation and charge transport, contributing to a power conversion efficiency (PCE) of 17.15% of the corresponding all-PSCs. Moreover, when introducing another crystalline polymer acceptor BTP-2T2F into the PBBTz-Cl:PY-IT host blend, the absorption ditch in the range of 600–750 nm is filled, and the blend morphology is further optimized with the trap density reducing. As a result, the ternary blend all-PSCs achieve a significantly improved PCE of 18.60%, which is among the highest values for all-PSCs to date.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012704

OSTI ID:: 2440567

Report Number(s):: BNL--226008-2024-JAAM

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 3 Vol. 36; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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