A thieno[3,2-b][1]benzothiophene isoindigo building block for additive- and annealing-free high-performance polymer solar cells

Wan Yue; Raja Shahid Ashraf; Christian B Nielsen; Elisa Collado-Fregoso; Muhammad R Niazi; Syeda Amber Yousaf; Mindaugas Kirkus; Hung-Yang Chen; Aram Amassian; James R Durrant; Iain McCulloch

doi:10.1002/adma.201501841

A thieno[3,2-b][1]benzothiophene isoindigo building block for additive- and annealing-free high-performance polymer solar cells

Adv Mater. 2015 Aug 26;27(32):4702-7. doi: 10.1002/adma.201501841. Epub 2015 Jul 14.

Affiliations

¹ Department of Chemistry and Centre for Plastic Electronics, Imperial College London, London, SW7 2AZ, UK.
² Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
³ Department of Physics, Government College University, Lahore, 54000, Pakistan.

PMID: 26175063
DOI: 10.1002/adma.201501841

Abstract

A novel photoactive polymer with two different molecular weights is reported, based on a new building block: thieno[3,2-b][1]benzothiophene isoindigo. Due to the improved crystallinity, optimal blend morphology, and higher charge mobility, solar-cell devices of the high-molecular-weight polymer exhibit a superior performance, affording efficiencies of 9.1% without the need for additives, annealing, or additional extraction layers during device fabrication.

Keywords: additive free; annealing free; molecular weight; solar cells; thieno[3,2-b][1]benzothiophene isoindigo.