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Keywords:

  • anode buffer layers;
  • hybrid solar cells;
  • nickel oxides;
  • ZnO

Abstract

The open-circuit voltage of hybrid solar cells based on ZnO nanoparticles (nc-ZnO) and conjugated polymer MDMO-PPV increased significantly by replacing poly(3,4-ethylenedioxythiophene)-poly(styrenesulphonate) (PEDOT:PSS) with NiOx as the anode buffer layers. The open-circuit voltage as high as 0.828 V was obtained at high amount of ZnO (80% in weight) in the photoactive blend. Such improvement could be ascribed to the appropriate energy level of NiOx, which allows less energy loss for holes while having a sufficiently high-conduction band minimum to function as a more efficient electron/exciton blocking layer than PEDOT:PSS. The increase of open-circuit voltage, as well as photocurrent, resulted in a 42% improvement in power conversion efficiency. The results indicate that nickel oxide has promising potential to increase the performance of hybrid solar cells based on nc-ZnO.