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A

Bo Xiao1,2, Ailing Tang1, Qianqian Zhang3

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience , National Center for Nanoscience and Technology (NCNST) , Beijing 100190 , P. R. China.

ACS Applied Materials & Interfaces
|September 19, 2018
PubMed
Summary
This summary is machine-generated.

New small molecule acceptors based on 2-(1,1-Dicyanomethylene)rhodanine (RCN) improve organic solar cell performance. The benzotriazole-based acceptor (BTA3) achieved a 5.64% power conversion efficiency with poly(3-hexylthiophene) (P3HT).

Keywords:
2-(1,1-dicyanomethylene)rhodanineP3HTbenzothiadiazolebenzotriazolenon-fullerene acceptorsphotovoltaic

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • 2-(1,1-Dicyanomethylene)rhodanine (RCN) is a key electron-deficient unit for non-fullerene acceptors (NFAs).
  • RCN-based NFAs show high power conversion efficiency (PCE) with complex polymers but underperform with poly(3-hexylthiophene) (P3HT).
  • Improving RCN-based NFA performance with classic donors like P3HT is crucial for advancing organic solar cells.

Purpose of the Study:

  • To design and synthesize novel RCN-based small molecular acceptors (SMAs) to enhance photovoltaic properties.
  • To investigate the effect of different bridging units (benzothiadiazole vs. benzotriazole) on the performance of RCN-based NFAs.
  • To optimize the performance of organic solar cells utilizing P3HT as the electron donor.

Main Methods:

  • Synthesis of two RCN-based SMAs, BT3 and BTA3, featuring an A2-A1-D-A1-A2 structure.
  • Fabrication and characterization of organic solar cells using P3HT blended with BT3 and BTA3.
  • Analysis of optoelectronic properties, including open-circuit voltage (VOC), fill factor (FF), and PCE.
  • Measurement of film morphology and electron mobility to understand charge transport mechanisms.

Main Results:

  • The P3HT:BTA3 solar cell achieved a promising PCE of 5.64%, with a VOC of 0.90 V and FF of 0.65.
  • The P3HT:BT3 solar cell showed significantly lower performance (PCE = 2.55%, VOC = 0.72 V, FF = 0.61).
  • The BTA3-based device exhibited higher electron mobility, indicating improved electron transport pathways.

Conclusions:

  • Introducing a weak electron-withdrawing benzotriazole (BTA) unit is more effective than benzothiadiazole (BT) for improving RCN-based NFA performance with P3HT.
  • The BTA3 acceptor facilitates better charge transport, leading to enhanced solar cell efficiency.
  • This study provides a viable strategy for developing high-performance RCN-based NFAs for organic photovoltaics.