Cu 2 S nanocrystals incorporated highly efficient non-fullerene ternary organic solar cells

Govinda Lakhotiya, Namdeo Belsare, Abhimanyu Rana, Vinay Gupta

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Here, we report Cu 2 S nanocrystals based non-fullerene ternary polymer solar cells by incorporating Cu 2 S in conjugated polymer (PBDB-T: poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b′]dithiophene))-alt-(5,5-(1′,3′-di-2-thienyl-5′,7′-bis(2-ethylhexyl) benzo[1′,2′-c:4′,5′-c′]dithiophene-4,8-dione))]) and small molecule non-fullerene compound (ITIC:3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]dithiophene). The devices were fabricated in inverted configuration i.e. ITO/ZnO/PBDB-T: Cu 2 S NCs: ITIC/MoO 3 /Ag. Effect of concentration of Cu 2 S nanocrystals on the performance parameters of PBDB-T: ITIC based organic solar cells is studied. An enhancement in the power conversion efficiency from 8.24% to 9.53% is achieved for the optimum concentration of Cu 2 S nanocrystals in the organic photoactive blend. The cause of improvement in the performance parameters of the device is investigated by means of the light intensity dependent electrochemical impedance spectroscopy and atomic force microscopy. It is found that the devices with Cu 2 S nanocrystals have less trap-assisted recombination.

Original languageBritish English
Pages (from-to)394-399
Number of pages6
JournalCurrent Applied Physics
Volume19
Issue number4
DOIs
StatePublished - Apr 2019

Keywords

  • Cu S nanocrystals
  • ITIC
  • Organic solar cells
  • PBDB-T
  • Photo electrochemical impedance spectroscopy

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