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Improving the efficiency of ITO/nc-TiO2/CdS/P3HT:PCBM/PEDOT:PSS/Ag inverted solar cells by sensitizing TiO2 nanocrystalline film with chemical bath-deposited CdS quantum dots

Chong Chen12* and Fumin Li12

Author Affiliations

1 Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, People’s Republic of China

2 School of Physics and Electronics, Henan University, Kaifeng 475004, People’s Republic of China

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Nanoscale Research Letters 2013, 8:453  doi:10.1186/1556-276X-8-453

Published: 31 October 2013

Abstract

An improvement in the power conversion efficiency (PCE) of the inverted organic solar cell (ITO/nc-TiO2/P3HT:PCBM/PEDOT:PSS/Ag) is realized by depositing CdS quantum dots (QDs) on a nanocrystalline TiO2 (nc-TiO2) film as a light absorption material and an electron-selective material. The CdS QDs were deposited via a chemical bath deposition (CBD) method. Our results show that the best PCE of 3.37% for the ITO/nc-TiO2/CdS/P3HT:PCBM/PEDOT:PSS/Ag cell is about 1.13 times that (2.98%) of the cell without CdS QDs (i.e., ITO/nc-TiO2/P3HT:PCBM/PEDOT:PSS/Ag). The improved PCE can be mainly attributed to the increased light absorption and the reduced recombination of charge carriers from the TiO2 to the P3HT:PCBM film due to the introduced CdS QDs.

Keywords:
Inverted solar cell; Quantum dots; P3HT:PCBM; CdS; Efficiency