Thiophene and naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole based alternating copolymers for polymer solar cells

Yuxiang Li, Tack Ho Lee, Jihyeon Kim, Song Yi Park, Seyeong Song, Sungu Hwang, Jin Young Kim, Han Young Woo

Research output: Contribution to journalArticle

2 Citations (Scopus)

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 ~800 nm and d-PPDTNTz exhibited a deeper HOMO and preferentially face-on orientation in pristine and blended films with PC71BM. The detailed optical, electrochemical, thermal, morphological and the resulting photovoltaic characteristics were studied. The best power conversion efficiency of ~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.

Original languageEnglish
Pages (from-to)553-559
Number of pages7
JournalJournal of Photopolymer Science and Technology
Volume29
Issue number4
DOIs
Publication statusPublished - 2016 Jan 1

Keywords

  • Naphtho[1,2-c:5,6-c]bis[1,2,5]thiadiazole (NTz)
  • Noncovalent coulombic interactions
  • Photovoltaic
  • Planarity
  • Polymer solar cells (PSCs)
  • Semi-crystalline

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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