期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 50, 页码 60288-60298出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c18952
关键词
layer-by-layer; sequential process; non-fullerene acceptor; structure; vertical distribution
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korean Government [NRF2015R1A5A1009962, NRF-2021R1A2C2010179]
- Korea Electric Power Corporation [R19XO01-11]
- BK21 Four Program of Pusan National University
- Samsung Electronics
This study systematically investigates films fabricated via LbL processing of three different systems, focusing on the structural and morphological transitions associated with diffusion process controlled by thermal annealing and an additive solvent. Different diffusion and crystal formation mechanisms were identified, leading to insights on the photovoltaic properties associated with various LbL conditions and suggestions for an ideal path towards a better device.
Recently, with the development of figure-of-merit non-tullerene acceptor materials combined with a ternary strategy and layer-by-layer (LbL) processing, the efficiency of single-junction organic solar cells has exceeded 18%. However, the structural properties of LbL-processed films have not been sufficiently elucidated. Herein, we systematically investigate films fabricated via LbL processing of three different systems, including a ternary system. In particular, we focus on the structural and morphological transitions associated with the diffusion process controlled by thermal annealing and an additive solvent. Different diffusion and crystal formation mechanisms were clearly identified, which were observed to be dependent on the characteristics of the upper layer formed during the LbL process. Based on this insight, the photovoltaic properties associated with various LbL conditions are elucidated, and an ideal path toward a better device is suggested.
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