High-Crystalline Medium-Band-Gap Polymers Consisting of Benzodithiophene and Benzotriazole Derivatives for Organic Photovoltaic Cells

被引：64

作者：

Kim, Ji-Hoon ^{[1
]}

Song, Chang Eun ^{[2
]}

Shin, Nara ^{[4
]}

Kang, Hyunbum ^{[8
]}

Wood, Sebastian ^{[6
,7
]}

Kang, In-Nam ^{[3
]}

Kim, Bumjoon J. ^{[8
]}

Kim, BongSoo ^{[4
]}

Kim, Ji-Seon ^{[6
,7
]}

Shin, Won Suk ^{[5
]}

Hwang, Do-Hoon ^{[1
]}

机构：

[1] Pusan Natl Univ, Dept Chem & Chem, Inst Funct Mat, Pusan 609735, South Korea

[2] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea

[3] Catholic Univ Korea, Dept Chem, Puchon 420743, South Korea

[4] Korea Inst Sci & Technol, Photoelect Hybrids Res Ctr, Seoul 136791, South Korea

[5] Korea Res Inst Chem Technol, Taejon 305343, South Korea

[6] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England

[7] Univ London Imperial Coll Sci Technol & Med, Ctr Plast Elect, London SW7 2AZ, England

[8] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Taejon 305701, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 24期

基金：

英国工程与自然科学研究理事会;

关键词：

organic photovoltaic device; medium-band-gap polymer; (triisopropylsily)ethynyl-substituted benzodithiophene; 2D-GIXS; resonant Raman spectroscopy; OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; SEMICONDUCTING POLYMERS; RATIONAL DESIGN; SIDE-CHAINS; PERFORMANCE; COPOLYMERS; ACCEPTOR; DIKETOPYRROLOPYRROLE; DITHIENOSILOLE;

D O I：

10.1021/am401926h

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Two semiconducting conjugated polymers were synthesized via Stille polymerization. The structures combined unsubstituted or (triisopropylsilyl)ethynyl (TIPS)-substituted 2,6-bis(trimethylstannyl)benzo[1,2-b':4.5-bldithiophene (BDT) as a donor unit and benzotriazole with a symmetrically branched alkyl side chain (DTBTz) as an acceptor unit. We investigated the effects of the different BDT moieties on the optical, electrochemical, and photovoltaic properties of the polymers and the film crystallinities and carrier mobilities. The optical-band-gap energies were measured to be 1.97 and 1.95 eV for PBDT-DTBTz and PTIPSBDT-DTBTz, respectively. Bulk heterojunction photovoltaic devices were fabricated and power conversion efficiencies of 5.5% and 2.9% were found for the PTIPSBDT-DTBTz- and PBDT-DTBTz-based devices, respectively. This difference was explained by the more optimal morphology and higher carrier mobility in the PTIPSBDT-DTBTz-based devices. This work demonstrates that, under the appropriate processing conditions, TIPS groups can change the molecular ordering and lower the highest occupied molecular orbital level, providing the potential for improved solar cell performance.

引用

页码：12820 / 12831

页数：12

共 48 条

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