2,2′-Bis(1,3,4-thiadiazole)-Based π-Conjugated Copolymers for Organic Photovoltaics with Exceeding 8% and Its Molecular Weight Dependence of Device Performance

被引：36

作者：

Fukuta, Seijiro ^{[1
]}

Seo, Jooyeok ^{[2
]}

Lee, Hoyeol ^{[3
,4
]}

Kim, Hwajeong ^{[2
]}

Kim, Youngkyoo ^{[2
]}

Ree, Moonhor ^{[3
,4
]}

Higashihara, Tomoya ^{[1
]}

机构：

[1] Yamagata Univ, Grad Sch Organ Mat Sci, Dept Organ Mat Sci, 4-3-16 Jo Nan, Yonezawa, Yamagata 9928510, Japan

[2] Kyungpook Natl Univ, Sch Appl Chem Engn, Dept Chem Engn, Organ Nanoelect Lab, Univ Rd 80, Daegu 41566, South Korea

[3] Pohang Univ Sci & Technol, Dept Chem, Div Adv Mat Sci, Polymer Res Inst, Pohang 37673, South Korea

[4] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 37673, South Korea

来源：

MACROMOLECULES | 2017年 / 50卷 / 03期

基金：

日本科学技术振兴机构; 日本学术振兴会; 新加坡国家研究基金会;

关键词：

POLYMER SOLAR-CELLS; SIGNIFICANT IMPACT; CHARGE-TRANSPORT; HIGHLY EFFICIENT; THIAZOLOTHIAZOLE; MORPHOLOGY; SEMICONDUCTORS; AGGREGATION; ORIENTATION; BACKBONE;

D O I：

10.1021/acs.macromol.6b02475

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

A series of novel pi-conjugated copolymers based on 2,2'-bis(1,3,4-thiadiazole) (BTDz) have been developed. Among them, the BTDz-based donor-acceptor alternating copolymer with the (E)-1,2-di(3-(2-ethylhexyl)thiophene)vinylene donor unit (PBTDzTV) exhibited a high solubility and high crystallinity. PBTDzTVs favorably self assembled, forming face-on and edge-on multibilayer structures in thin nanoscale films. The relative volume fractions of these structures varied depending on the polymer's molecular weight. The higher molecular weight polymer formed a higher volume fraction of the face-on structure; in particular, the polymer with a 26.6 kDa of number-average molecular weight made only the face-on structure. The device performance was improved as the polymer molecular weight and the volume fraction of the face-on structure increased. The bulk-heterojunction photovoltaic device based on PBTDzTV:PC71BM demonstrated the high power conversion efficiency (PCE) of 8.04% when the device was fabricated with the highest molecular weight polymer having the face-on structure.

引用

页码：891 / 899

页数：9

共 47 条

[1] Competition between recombination and extraction of free charges determines the fill factor of organic solar cells [J].