Efficient, Thermally Stable, and Mechanically Robust All-Polymer Solar Cells Consisting of the Same Benzodithiophene Unit-Based Polymer Acceptor and Donor with High Molecular Compatibility

Lee, Jin‐Woo; Sun, Cheng; Ma, Boo Soo; Kim, Hyeong Jun; Wang, Cheng; Ryu, Jong Min; Lim, Chulhee; Kim, Taek‐Soo; Kim, Yun‐Hi; Kwon, Soon‐Ki; Kim, Bumjoon J.

doi:10.1002/aenm.202003367

Efficient, Thermally Stable, and Mechanically Robust All-Polymer Solar Cells Consisting of the Same Benzodithiophene Unit-Based Polymer Acceptor and Donor with High Molecular Compatibility

Journal Article · Mon Dec 21 00:00:00 EST 2020 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.202003367· OSTI ID:1837372

Lee, Jin‐Woo ^[1]; Sun, Cheng ^[2]; Ma, Boo Soo ^[1]; Kim, Hyeong Jun ^[1]; Wang, Cheng ^[3]; Ryu, Jong Min ^[2]; Lim, Chulhee ^[1]; Kim, Taek‐Soo ^[1]; Kim, Yun‐Hi ^[2]; Kwon, Soon‐Ki ^[2]; ^[1]

Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
Gyeongsang National University, Jinju (Korea, Republic of)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

All-polymer solar cells (all-PSCs) are a highly attractive class of photovoltaics for wearable and portable electronics due to their excellent morphological and mechanical stabilities. Recently, new types of polymer acceptors (P_As) consisting of non-fullerene small molecule acceptors (NFSMAs) with strong light absorption have been proposed to enhance the power conversion efficiency (PCE) of all-PSCs. However, polymerization of NFSMAs often reduces entropy of mixing in PSC blends and prevents the formation of intermixed blend domains required for efficient charge generation and morphological stability. One approach to increase compatibility in these systems is to design P_As that contain the same building blocks as their polymer donor (P_D) counterparts. Here, a series of NFSMA-based P_As [P(BDT2BOY5-X), (X = H, F, Cl)] are reported, by copolymerizing NFSMA (Y5-2BO) with benzodithiophene (BDT), a common donating unit in high-performance P_Ds such as PBDB-T. All-PSC blends composed of PBDB-T PD and P(BDT2BOY5-X) P_A show enhanced molecular compatibility, resulting in excellent morphological and electronic properties. Specifically, PBDB-T:P(BDT2BOY5-Cl) all-PSC has a PCE of 11.12%, which is significantly higher than previous PBDB-T:Y5-2BO (7.02%) and PBDB-T:P(NDI2OD-T2) (6.00%) PSCs. Additionally, the increased compatibility of these all-PSCs greatly improves their thermal stability and mechanical robustness. For example, the crack onset strain (COS) and toughness of the PBDB-T:P(BDT2BOY5-Cl) blend are 15.9% and 3.24 MJ m^-3, respectively, in comparison to the PBDB-T:Y5-2BO blends at 2.21% and 0.32 MJ m^-3.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1837372

Alternate ID(s):: OSTI ID: 1804550

Journal Information:: Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 5 Vol. 11; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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