Highly Stable Polymer Solar Cells Based on Poly(dithienobenzodithiophene-co-thienothiophene)

Autor:	Bongsoo Kim, Youngwoon Yoon, Nara Shin, Hui Jun Yun, Hae Jung Son, Yun-Hi Kim, Sang Yong Ju, Soon Ki Kwon
Rok vydání:	2015
Předmět:	chemistry.chemical_classification Materials science Polymers and Plastics Band gap Organic Chemistry Photovoltaic system Polymer Polymer solar cell Amorphous solid Inorganic Chemistry chemistry Chemical engineering Yield (chemistry) Polymer chemistry Materials Chemistry
Zdroj:	Macromolecules. 48:3890-3899
ISSN:	1520-5835 0024-9297
Popis:	It is important to develop new donor (D)–acceptor (A) type low band gap polymers for highly stable polymer solar cells (PSCs). Here, we describe the synthesis and photovoltaic properties of two D–A type low band gap polymers. The polymers consist of dithienobenzodithiophene (DTBDT) moieties with expanded conjugation side groups as donors and 2-ethyl-1-(thieno[3,4-b]thiophen-2-yl)hexan-1-one (TTEH) or 6-octyl-5H-thieno[3′,4′:4,5]thieno[2,3-c]pyrrole-5,7(6H)-dione (DTPD) as acceptors to give pDTBDT-TTEH and pDTBDT-DTPD polymers, respectively. The pDTBDT-TTEH is quite flat, resulting in a highly crystalline film. In contrast, the pDTBDT-DTPD is highly twisted to yield an amorphous film. Photovoltaic devices based on pDTBDT-TTEH and pDTBDT-DTPD exhibited power conversion efficiencies (PCEs) of 6.74% and 4.44%, respectively. The PCE difference results mainly from morphological differences between the two polymer:PC71BM blend films; the pDTBDT-TTEH polymer formed a nanoscopically networked domains in the blend ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::96682f9fe70a8d826fcc8b3908ff03ec https://doi.org/10.1021/acs.macromol.5b00514 Zobrazit plný text záznamu