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

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

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Keywords: nano

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 trend of the power conversion efficiency from 3.77% to 1.52%. This trend was proved by the increase of dynamic resistance, including: charge recombination resistance at counter electrode/electrolyte and FTO/TiO2 interface (Rct1 increased from 204.5 Ω to 780.1 Ω), charge transfer resistance within the TiO2 film and at the TiO2/QDs/electrolyte interface (Rct2 increased from 24.65 Ω to 466.7 Ω). The decreased efficiency and increased dynamic resistance might cause the quantum dots sensitized solar cell degradation

Published
2018-11-29
Section
Regular articles