A study of the degradation process of quantum dots sensitized solar cells

Tung Thanh Ha, Thang Van Bui, Thao Thu Nguyen, Phat Tan Nguyen, Dat Thanh Huynh, Vinh Quang Lam

Abstract


In this work, quantum dots sensitized solar cells had been successfully prepared based on Cu2S counter electrode and TiO2/CdS/Cd1-xMnxSe/ZnS photoanode. The highest power conversion efficiency was 3.77%. Herein, we studied the degradation process of quantum dots sensitized solar cells by investigating the photocurrent – voltage (I-V) curves and electrochemical impedance spectroscopy. The results showed that there was a downward of the power conversion efficiency from 3.77% to 1.52%. This trend was proved by the increasing of dynamic resistance, including: charge recombination resistance at counter electrode/electrolyte and FTO/TiO2 interface (Rct1 increased from 204.5 to 780.1), charge transfer resistance within the TiO2 film and at the TiO2/QDs/electrolyte interface (Rct2 increased from 24.65 to 466.7). The decreased efficiency and increased dynamic resistance might cause the quantum dots sensitized solar cell degradation.

Keywords


Degradation, Dynamic resistance, Nanocrystal

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Published by: IOP Publishing and Vietnam Academy of Science and Technology
Frequency: Articles appear online as they are published with print copies published 4 times per year
ISSN: Print: 2043-6254; Online: 2043-6262
DOI Range: 10.1088/issn.2043-6262

© Copyright 2016 Advances in Natural Sciences: Nanoscience and Nanotechnology