4.7 Article

High-Efficiency P3HT-Based All-Polymer Solar Cells with a Thermodynamically Miscible Polymer Acceptor

Journal

SOLAR RRL
Volume 6, Issue 7, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202200073

Keywords

all-polymer solar cells; phase separation; poly(3-hexylthiophene); polymer acceptor; thermodynamic miscibility

Funding

  1. Ministry of Science and Technology of China [2017YFA0206600, 2019YFA0705900]
  2. National Natural Science Foundation of China [21875072, U20A6002, 22109046]
  3. Guangdong Innovative and Entrepreneurial Research Team Program [2019ZT08L075]
  4. Open Funds of State Key Laboratory of Fine Chemicals [KF1901]
  5. China Postdoctoral Science Foundation [2020TQ0102]

Ask authors/readers for more resources

This study reports highly efficient all-polymer solar cells based on P3HT by blending it with a thermodynamically miscible polymer acceptor. The well-mixed fibrillary active layer morphology generated by the blend leads to a record power conversion efficiency of 7.35% for P3HT-based all-PSCs.
Poly(3-hexylthiophene) (P3HT) is the most classical conjugated polymer for organic photovoltaics due to its low-cost and synthetic scalability. However, P3HT-based organic photovoltaics suffer from inferior device performance with respect to donor-acceptor copolymers. Particularly, the device performance of P3HT-based all-polymer solar cells (all-PSCs) is rather poor due to the challenges in reaching ideal bulk-heterojunction morphology. Herein, highly efficient P3HT-based all-PSCs by blending P3HT with a thermodynamic miscible polymer acceptor are reported. Among the three state-of-the-art polymer acceptors (N2200, PYT, and DCNBT-IDT), N2200 and PYT are thermodynamically immiscible with P3HT and thus led to excessive phase separation when blended with P3HT, whereas DCNBT-IDT displayed proper thermodynamic miscibility with P3HT and generated the formation of well-mixed fibrillary active layer morphology. As a result, a power conversion efficiency of 7.35% has been achieved by P3HT:DCNBT-IDT blend, which is a new record for P3HT-based all-PSCs and largely higher than any previous results. Broad implication for further efficiency enhancement of P3HT-based all-PSCs is provided in the results and a promising pathway to realize highly efficient yet cost-effective solar energy production is suggested.

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