Effects of morphology evolution on solution-processed small molecule photovoltaics via a solvent additive
作者： Quoc Viet Hoang , Shafket Rasool , Sora Oh , Doan Van Vu , Da Hun Kim
DOI: 10.1039/C7TC02088K
关键词: Polymer solar cell 、 Fullerene 、 Organic chemistry 、 Stacking 、 Solvent 、 Small molecule 、 Materials science 、 Organic solar cell 、 Acceptor 、 Phase (matter) 、 Chemical engineering
摘要: A newly synthesized small molecule donor, BDTT-2DPPBFu, is designed for incorporation into the photo-active layer in solution-processed organic photovoltaics (SM-OPVs). The effects of a solvent additive (1-chloronaphthalene, CN) on bulk heterojunction morphology BDTT-2DPPBFu donor:fullerene derivative acceptor (PC71BM) are investigated and correlated with device performance. TEM analysis revealed that nanomorphology SM-OPVs evolved dramatically increasing volume. With an optimum concentration 2.5 vol% CN, fibrillar interpenetrating network order exciton diffusion length (∼10–15 nm) formed, resulting improvement short-circuit current density, fill factor, power conversion efficiency. Further GIWAXS studies have shown π–π stacking distance molecules reduced inter-mixing PC71BM within BDTT-2DPPBFu-rich phase processed from CN increased, leading to enhanced charge transport recombination transfer resistance. present work provides important progress layer, which can be effectively tuned via use SM-OPVs.
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