Dielectric additive enables humidity-independent preparation of blend morphology for highperformance, large-area organic photovoltaics

Authors
Park, SungminYoon, SeongwonAhn, HyungjuYu, HyeonggeunShin, Eul-YongCho, KangsikJang, Yoon HeeJun, YongseokSon, Hae Jung
Issue Date
2025-06
Publisher
CELL PRESS
Citation
Joule, v.9, no.6
Abstract
Dielectric material in bulk-heterojunctions can play critical roles in exciton polarization and morphology control. We develop carvone (CV) dielectric additive to prepare high-efficiency, large-area organic photovoltaics (OPVs). CV forms a complex with L8-BO, which enhances forming uniform crystallites of acceptors as well as exciton dissociation in D18:N3:L8-BO blend. Furthermore, strong inward Marangoni flows induced by CV addition during blade coating enable the evolution of homogeneous morphology over large areas, irrespective of the surface energy of the electron-transporting layer. As a result, OPVs exhibited improved performances and, in particular, the device using binary D18:PM6 donors achieved efficiency of 17.44% for an active area of 1 cm2 and the corresponding module showed 16.27% efficiency. This is among the highest OPV module efficiency achieved, with active areas above 20 cm2. Importantly, it is demonstrated that CV addition is effective for reproducible preparation of the optimal blend morphology in ambient air with relative from 10% to 70%.
Keywords
BINDING-ENERGY; FLOW
ISSN
2542-4351
URI
https://pubs.kist.re.kr/handle/201004/152791
DOI
10.1016/j.joule.2025.101927
Appears in Collections:
KIST Article > Others
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