Important role of alloyed polymer acceptor for high efficiency and stable large-area organic photovoltaics

Authors
Park, SungminPark, So HyunJin, HyunjungYoon, SeongwonAhn, HyungjuShin, SeoeunKwak, KyungwonNah, SangheeShin, Eul-YongNoh, Jun HongMin, Byoung KounSon, Hae Jung
Issue Date
2022-07
Publisher
Elsevier BV
Citation
Nano Energy, v.98
Abstract
We developed high performance PM6:N3 bulk-heterojunctions by synthesizing polymers as the second acceptor. The acceptor PY-P2 where a biphenyl linker makes the polymer chain to have high dihedral angles forms intricate alloy-like composites in N3 domains whereas stiff polymer chain of PY-T2 exists separated from the acceptor domain. Introduction of PY-P2 results in much longer lifetimes and diffusion lengths of excitons generated in N3 domain of the PM6:N3:PY-P2 blend compared to those of the excitons in PM6:N3 as well as PM6: N3:PY-T2. Consequently, the PM6:N3:PY-P2 based OPV devices show improved exciton dissociation and change transport with reduced charge recombination. The PM6:N3:PY-P2 organic photovoltaic (OPV) devices prepared with blade-coating at 1 cm2 active area achieved efficiency of 15.2% compared with 12.9% of the PM6:N3 control device; whereas, the corresponding OPV device using PY-T2 shows decreased efficiency of 11.7%. OPV mini-module (active area 5.4 cm2) with PY-P2 achieves high efficiency of 14.7% compared with 11.9% of the PM6:N3 devices. Furthermore, the alloyed PY-P2 acceptor effectively improves OPV thermal stability under 85 degrees C heating for 1000 h, compared with PY-T2 and control devices. We demonstrated importance of the second polymer acceptor for achieving high-performance large-area OPV, which is significantly affected by its chemical structure.
Keywords
SOLAR-CELLS; THERMAL-STABILITY; ALL-POLYMER; BLEND; PERFORMANCE; DYNAMICS; Organic photovoltaics; Large-area modules; Bulk-heterojunctions; Alloyed polymer acceptors; High-performances
ISSN
2211-2855
URI
https://pubs.kist.re.kr/handle/201004/114921
DOI
10.1016/j.nanoen.2022.107187
Appears in Collections:
KIST Article > 2022
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