Affiliation:
1. College of Chemistry and Chemical Engineering/Institute of Polymers and Energy Chemistry (IPEC) Nanchang University 999 Xuefu Avenue Nanchang 330031 China
2. National Engineering Research Center for Carbohydrate Synthesis/Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal University 99 Ziyang Avenue Nanchang 330022 China
3. College of Chemistry and Chemical Engineering Gannan Normal University Ganzhou 341000 China
Abstract
AbstractThe sequential deposition process has demonstrated the great possibility to achieve a photolayer architecture with an ideal gradient phase separation morphology, which has a vital influence on the physical processes that determine the performance of organic solar cells (OSCs). However, the controllable preparation of pseudo‐planar heterojunction (P‐PHJ) with gradient distribution has not been effectively elucidated. Herein, a binary‐dilution strategy is proposed, the PM6 solution with micro acceptor BO‐4Cl and the L8‐BO solution with micro donor PM6 respectively, to form P‐PHJ film. This architecture exists good donor (D) and acceptor (A) vertical gradient distribution and larger D/A interpenetrating regions, which promotes exciton generation and dissociation, shortens charge transport distance and optimizes carrier dynamics. Moreover, the dilution of PM6 by BO‐4Cl promotes the regulation of active layer aggregation size and phase purity, thus alleviating energy disorder and voltage loss. As a result, the P‐PHJ device exhibits an outstanding power conversion efficiency of 19.32% with an excellent short‐circuit current density of 26.92 mA cm−2, much higher than planar binary heterojunction (17.67%) and ternary bulk heterojunction (18.49%) devices. This research proves a simple but effective method to provide an avenue for constructing desirable active layer morphology and high‐performance OSCs.
Funder
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
3 articles.
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