All-polymer solar cells approaching 12% efficiency with a new π-conjugated polymer donor enabled by a nonhalogenated solvent process

Thavamani Gokulnath, Jungmin Choi, Hyunjung Jin, Ho Yeol Park, Kyungmin Sung, Yeongju Do, Hyungjin Park, Saripally Sudhaker Reddy, Jehan Kim, Myungkwan Song, Jinhwan Yoon, Sung Ho Jin

Research output: Contribution to journalArticleResearchpeer-review

2 Citations (Scopus)

Abstract

High efficiency and nonhalogenated solvent processing are important issues for commercial application of all-polymer solar cells (all-PSCs). In this regard, we increased the photovoltaic performance of all-PSCs to a benchmark power conversion efficiency (PCE) of 11.66% by manipulating the pre-aggregation of a new π-conjugated polymer donor (Nap-SiBTz) using toluene as a solvent. This use of Nap-SiBTz enhanced the absorption coefficient (λmax = 9.30 × 104 cm-1), increased charge carrier mobility, suppressed trap-assisted recombination, improved bulk heterojunction morphology, and resulted in high PCEs of all-PSCs with an active layer thickness of 200 nm. To overcome severe charge recombination and energy losses, a 1-phenylnapthalene additive was used to achieve a well-ordered microstructure and molecular packing that inherently improved the device performances. The resulting encapsulation-free devices exhibited good ambient and thermal stabilities. The results of this study augur well for the future of the roll-to-roll production of all-PSCs.

Original languageEnglish
Pages (from-to)28231-28241
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number24
DOIs
Publication statusPublished - 8 Jun 2021
Externally publishedYes

Keywords

  • all-polymer solar cells
  • high PCE
  • new π-conjugated polymer donor
  • nonhalogenated solvent

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