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

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22 Citations (Scopus)


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 & Interfaces
Issue number24
Publication statusPublished - 8 Jun 2021
Externally publishedYes


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

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