Thiophene and Naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole Based Alternating Copolymers for Polymer Solar Cells
- Authors
- Li, Yuxiang; Lee, Tack Ho; Kim, Jihyeon; Park, Song Yi; Song, Seyeong; Hwang, Sungu; Kim, Jin Young; Woo, Han Young
- Issue Date
- 2016
- Publisher
- TECHNICAL ASSOC PHOTOPOLYMERS,JAPAN
- Keywords
- Naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NTz); Noncovalent Coulombic interactions; Planarity; Semi-crystalline; photovoltaic; Polymer solar cells (PSCs)
- Citation
- JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY, v.29, no.4, pp.553 - 559
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHOTOPOLYMER SCIENCE AND TECHNOLOGY
- Volume
- 29
- Number
- 4
- Start Page
- 553
- End Page
- 559
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/90129
- DOI
- 10.2494/photopolymer.29.553
- ISSN
- 0914-9244
- Abstract
- Two planar type photovoltaic polymers based on naphthobisthiadiazole, poly(2,5-bis(2-hexyldecyloxy)phenylene-alt-(5,10-dithiophen-2-yl)naphtho [1,2-c :5,6-c]bis [1,2,5]thiadiazole) (h-PPDTNTz) and poly(2,5-bis(2-decyltetradecyloxy)phenylene-alt-(5,10-dithiophen-2-yl)naphtho [1,2-c:5,6-c]bis[1,2,5]thiadiazole) (d-PPDTNTz) were synthesized by incorporating intrachain noncovalent Coulombic interactions in the molecular design. To achieve a delicate balance of molecular weight, solubility as well as bulk film morphology, hexyldecyloxy (h-) and decyltetradecyloxy (d-) side-chains were substituted, which played a decisive role in modulating morphology, film packing structure and macroscopic device properties. Both polymers showed a broad light absorption up to similar to 800 nm and d-PPDTNTz exhibited a deeper HOMO and preferentially face-on orientation in pristine and blended films with PCIIBM. The detailed optical, electrochemical, thermal, morphological and the resulting photovoltaic characteristics were studied. The best power conversion efficiency of similar to 6.7% was measured for d-PPDTNTz:PC71BM, suggesting that the careful choice of side-chains is necessary for fully optimize the photovoltaic materials and devices.
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