首页|The halogen effect of perylene diimide-based non-fullerene acceptors on photovoltaic properties
The halogen effect of perylene diimide-based non-fullerene acceptors on photovoltaic properties
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To develop photovoltaic materials based on perylene diimide,two non-fullerene acceptors namely PCPD-F and PCPD-Cl are rationally designed and readily synthesized.By introducing the cyclopentadidiiophene unit with the strong electron-donating ability,PCPD-F and PCPD-Cl exhibit strong and bathochromic absorption compared to other perylene diimide derivatives.Meanwhile,different halogens in PCPD-F and PCPD-Cl significantly affect the physicochemical properties and device performance.With the substitution of chlorine atom,PCPD-Cl shows relatively broad absorption and strong crystallinity.However,the chlorination makes PCPD-Cl less miscible with polymer donors,leading to the unfavorable morphology with large-scale phase separation in organic solar cells.Consequently,the device based on PCPD-F achieves the best power conversion efficiency of 9.03% by blending with the polymer donor PM6,which is among the high-performance organic solar cells based on perylene diimide.This work demonstrates it is crucial to meticulously select the substituted atom and position in the design of non-fullerene acceptors.
Organic solar cellNon-fullerene acceptorPerylene diimideHalogenation
Xiaoyang Zheng、Qingyun Wei、Tong Shan
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School of Chemistry and Chemical Engineering,Shanghai Key Lab of Electrical Insulation and Thermal Aging,Shanghai Jiao Tong University,Shanghai,200240,China
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