Unsymmetrical Small Molecules for Broad-Band Photoresponse and Efficient Charge Transport in Organic Phototransistors

被引：22

作者：

Lim, Dae-Hee ^{[2
,3
]}

Kang, Minji ^{[1
]}

Jang, Soo-Young ^{[1
]}

Hwang, Kyoungtae ^{[2
]}

Kim, In-Bok ^{[1
]}

Jung, Eunhwan ^{[4
]}

Jo, Yong-Ryun ^{[2
]}

Kim, Yeon-Ju ^{[2
]}

Kim, Jihong ^{[5
]}

Choi, Heechae ^{[4
]}

Kim, Tae-Wook ^{[6
]}

Mathur, Sanjay ^{[4
]}

Kim, Bong-Joong ^{[2
]}

Kim, Dong-Yu ^{[1
,2
]}

机构：

[1] Gwangju Inst Sci & Technol GIST, Res Inst Solar & Sustainable Energies RISE, Gwangju 61002, South Korea

[2] Gwangju Inst Sci & Technol GIST, Sch Mat Sci & Engn SMSE, Gwangju 61002, South Korea

[3] Korea Res Inst Chem Technol KRICT, Energy Mat Res Ctr, Daejeon 34114, South Korea

[4] Univ Cologne, Inorgan & Mat Chem, D-50939 Cologne, Germany

[5] Korea Inst S&T Evaluat & Planning KISTEP, Seoul 06775, South Korea

[6] Jeonbuk Natl Univ, Dept Flexible & Printable Elect, Jeonju 54896, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2020年 / 12卷 / 22期

基金：

新加坡国家研究基金会;

关键词：

photosensitizer; phototransistor; broad-band detection; surface doping; charge trap; POLYMER SEMICONDUCTORS; SOLAR-CELLS; N-TYPE; P-TYPE; DONOR; PERFORMANCE; PHOTODETECTORS; COPOLYMER;

D O I：

10.1021/acsami.0c02229

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Organic photosensitizers have been investigated as effective light-sensing elements that can promote strong absorption with high field-effect mobility in organic phototransistors (OPTs). In this study, a novel organic photosensitizer is synthesized to demonstrate broad-band photoresponse with enhanced electrical performance. An unsymmetrical small molecule of a solubilizing donor (D-sol)-acceptor (A)-dye donor (D-dye) type connected with a twisted conjugation system is designed for broad-band detection (ranging from 250 to 700 nm). This molecule has high solubility, thereby facilitating the formation of uniformly dispersed nanoparticles in an insulating polymer matrix, which is deposited on top of OPT semiconductors by a simple solution process. The broad-band photodetection shown by the organic photosensitizer is realized with improved mobility close to an order of magnitude and high on/off current ratio (similar to 10(5)) of the organic semiconductor. Furthermore, p-type charge transport behavior in the channel of the OPT is enhanced through the intrinsic electron-accepting ability of the organic photosensitizer caused by the unique molecular configuration. These structural properties of organic photosensitizers contribute to an improvement in broad-band photosensing systems with new optoelectronic properties and functionalities.

引用

页码：25066 / 25074

页数：9

共 49 条

[31] An A-D-A'-D-A type small molecule acceptor with a broad absorption spectrum for organic solar cells [J].