Enhancing Photovoltaic Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side Chain by Rational Molecular Design

doi:10.1021/ma401886a

CORC > 化学研究所 > 中国科学院化学研究所

	Enhancing Photovoltaic Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side Chain by Rational Molecular Design
	Shen, Ping 1,2,3; Bin, Haijun 1,2,3; Xiao, Lu 1; Li, Yongfang 1,4
刊名	MACROMOLECULES
	2013-12-24
卷号	46 期号:24 页码:9575-9586
ISSN号	0024-9297
DOI	10.1021/ma401886a
英文摘要	Rational molecular design of conjugated polymers and cautious optimization of morphologies of the active layer are critical for developing high performance " polymer solar cells (PSCs). In this work; we designed and synthesized -a new thiophene monomer TBTF attaching donor-acceptor (D-A) conjugated side chain with fluorinated 4,7-dithien-5-y1-2,1,3-benzodiathiazole (BTF) as acceptor unit, and synthesized two new two-dimension-conjugated (2D-conjugated) copolymers, P(BDT-TBTF) and P(BDT-TBTF/DPP), for the application as donor materials in PSCs. P(BDT-TBTF) is a new side chain D-A copolymer of benzodithiophene (BDT) and TBTF units, and P(BDT-TBTF/DPP) is a ternary D-A copolymer of BDT, TBTF and pyrrolo[3,4-c]pyrrole-1,4-dione (DPP) units. The introduction of TBTF unit with D-A conjugated side chain and DPP unit forming the ternary copolymer provides the opportunity to tune the optoelectronic properties of the resulting polymers. As expected, the binary copolymer P(BDT-TBTF) shows an enhanced absorption coefficient and lower-lying HOMO energy level, and the ternary copolymer P(BDT-TBTF/DPP) possesses a small bandgap and quite broad absorption band matched well with solar spectrum. These features are beneficial to achieving reasonable high short-circuit current (I) and high open-circuit voltage (V.). Bulk-heterojunction PSCs based on P(BDT-TBTF) showed an initial power conversion efficiency (PCE) of 5.66% with a high V., of 0.88 V and a J of 11.23 mA cm(-2), whereas P(BDT-TBTF/DDP) gave a PCE of 3.51% along with a higher J of 13.15 mA cm(-2). The Jsc and PCE of the devices were further improved by a simple methanol treatment, to 13.21 mA cm(-2) and 6.21% for P(BDT-TBTF) and 14.56 mA cm(-2) and 5% for P(BDT-Ti3TF/DPP), respectively. To the best of our knowledge, the PCE of 6.21% is the highest value reported for PSCs based on side chain D-A copolymers to date. This is a good example for a subtle tuning absorption properties, energy levels, charge transport and photovoltaic properties of the polymers by rational molecular design.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000329138000010
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/53899]
专题	中国科学院化学研究所
通讯作者	Li, Yongfang
作者单位	1.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, CAS Key Lab Organ Solids, Beijing 100190, Peoples R China 2.Xiangtan Univ, Coll Chem, Xiangtan 411105, Peoples R China 3.Xiangtan Univ, Key Lab Environm Friendly Chem & Applicat, Minist Educ, Xiangtan 411105, Peoples R China 4.Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Shen, Ping,Bin, Haijun,Xiao, Lu,et al. Enhancing Photovoltaic Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side Chain by Rational Molecular Design[J]. MACROMOLECULES,2013,46(24):9575-9586.
APA	Shen, Ping,Bin, Haijun,Xiao, Lu,&Li, Yongfang.(2013).Enhancing Photovoltaic Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side Chain by Rational Molecular Design.MACROMOLECULES,46(24),9575-9586.
MLA	Shen, Ping,et al."Enhancing Photovoltaic Performance of Copolymers Containing Thiophene Unit with D-A Conjugated Side Chain by Rational Molecular Design".MACROMOLECULES 46.24(2013):9575-9586.