Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003367
Keywords
all‐ polymer solar cells; BDT‐ based polymer acceptors; mechanical robustness; molecular compatibility; stretchability
Categories
Funding
- National Research Foundation of Korea (NRF) Grant of the Korean Government [2020M3D1A2102756, 2020M3D1A2102869, 2020M3H4A1A01086888, 2018R1A2A1A05078734]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) of the Korean Government [20173010013000]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- National Research Foundation of Korea [2020M3H4A1A01086888, 2020M3D1A2102756] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Researchers have developed a series of polymer acceptors based on non-fullerene small molecule acceptors, which show enhanced compatibility and performance when blended with high-performance polymer donors.
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(A)s) 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(A)s that contain the same building blocks as their polymer donor (P-D) counterparts. Here, a series of NFSMA-based P(A)s [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(D)s such as PBDB-T. All-PSC blends composed of PBDB-T P-D 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).
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