Modulation of the Molecular Orientation at the Bulk Heterojunction Interface via Tuning the Small Molecular Donor-Nonfullerene Acceptor Interactions

被引：27

作者：

Adil, Muhammad Abdullah ^{[1
,2
]}

Zhang, Jianqi ^{[1
]}

Deng, Dan ^{[1
]}

Wang, Zhen ^{[1
]}

Yang, Yang ^{[1
]}

Wu, Qiong ^{[1
]}

Wei, Zhixiang ^{[1
]}

机构：

[1] Chinese Acad Sci, CAS Key Lab Nanosyst & Hierarch Fabricat, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

来源：

ACS APPLIED MATERIALS & INTERFACES | 2018年 / 10卷 / 37期

基金：

中国国家自然科学基金;

关键词：

molecular packing orientation; nonfullerene systems; interface of the bulk heterojunction layer; interfacial molecular interactions; side chain length; ORGANIC SOLAR-CELLS; OPEN-CIRCUIT VOLTAGE; CONJUGATED POLYMERS; EFFICIENCY; PERFORMANCE; MORPHOLOGY; PHOTOVOLTAICS; ENERGY; LOSSES;

D O I：

10.1021/acsami.8b08608

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The interfacial molecular packing orientation of the nonfullerene systems at the donor-acceptor interface is considered as one of the key parameters in fabricating high-performance devices because of the anisotropic molecular characteristics of conjugated donors (D) and nonfullerene acceptors (A). However, regulating the interfacial orientation for the nonfullerene systems is still scarcely studied. Herein, modulation of the interfacial molecular packing orientation of bulk heterojunction layer is successfully realized via tuning the D-A interactions. The results indicate that the molecule with relatively shorter alkyl side chain (2F-C4C6) because of weak D-A interactions is unable to influence the molecular orientation of the active layer, as compared to their longer alkyl side-chain counterpart (2F-C6C8), which demonstrates strong D-A interactions and thus efficiently modulates the overall packing orientation. The power conversion efficiencies of 6.41 and 8.23% are obtained for the relatively short and long alkyl side-chain donors with IDIC acceptor, respectively. Hence strong D-A interactions because of long enough alkyl side chain on a donor small molecule can modify the interfacial molecular packing orientation of the system, leading to a better performing device.

引用

页码：31526 / 31534

页数：9

共 38 条

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2-P

[22] Photocurrent Enhancement from Diketopyrrolopyrrole Polymer Solar Cells through Alkyl-Chain Branching Point Manipulation [J].