Synthesis of a Conjugated D-A Polymer with Bi(disilanobithiophene) as a New Donor Component

Makoto Nakashima; Yousuke Ooyama; Takuya Sugiyama; Hiroyoshi Naito; Joji Ohshita

doi:10.3390/molecules21060789

Synthesis of a Conjugated D-A Polymer with Bi(disilanobithiophene) as a New Donor Component

Molecules. 2016 Jun 17;21(6):789. doi: 10.3390/molecules21060789.

Authors

Makoto Nakashima¹, Yousuke Ooyama², Takuya Sugiyama³, Hiroyoshi Naito⁴, Joji Ohshita⁵

Affiliations

¹ Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan. [email protected].
² Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan. [email protected].
³ Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan. [email protected].
⁴ Department of Physics and Electronics, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan. [email protected].
⁵ Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima 739-8527, Japan. [email protected].

Abstract

A new conjugated donor-acceptor (D-A) polymer pDSBT2-BT containing bi(disilano-bisthiophene) and benzothiadiazole as donor and acceptor units, respectively, was prepared. The polymer showed a broad UV-vis absorption band at λmax = 599 nm in chlorobenzene. The absorption band was shifted to λmax = 629 nm when the polymer was measured as a film, indicating enhanced interchain interactions of the polymer. Bulk hetero-junction polymer solar cells (BHJ-PSCs) were fabricated using pDSBT2-BT and PC71BM as host and guest materials, respectively. Optimization of cell fabrication conditions provided a maximal power conversion efficiency of 3.3% and the following cell parameters: Voc = 0.86 V, Jsc = 7.56 mA/cm², and FF = 0.51. Although the efficiency still leaves much to be desired, these data underscore the potential of pDSBT2-BT as a high-voltage polymer solar cell material.

Keywords: D-A polymer; bulk heterojunction; disilanobithiophene; polymer solar cell.

MeSH terms

Electric Power Supplies
Molecular Structure
Polymers / chemical synthesis*
Polymers / chemistry
Solar Energy*
Sunlight
Thiadiazoles / chemical synthesis*
Thiadiazoles / chemistry
Thiophenes / chemical synthesis*
Thiophenes / chemistry

Substances

Polymers
Thiadiazoles
Thiophenes
thiophene A
benzo-1,2,3-thiadiazole