Abstract
This work investigates the improvement in efficiency of quantum dot sensitized solar cells (QDSSCs) using copper selenide (Cu2Se) as a new counter electrode. Cu2Se counter-based QDSSC exhibits power conversion efficiency (η) of 2.28%, which is higher than the 1.17% efficiency of copper sulfide (CuS) counter electrode. Electrochemical impedance spectroscopy results show that by the changing counter electrode from CuS to Cu2Se, the charge transfer resistance at the counter electrode/electrolyte interfaces is reduced and, consequently, causes current density rise from 6.02mA/cm2 to 11.26mA/cm2. Also, open circuit voltage decay and dark current density–voltage results show that the lifetime of electron in the Cu2Se counter-based QDSSC is higher than that of QDSSC with CuS counter electrode. Therefore, Cu2Se counter electrode can be regarded as a promising alternative to the noble CuS counter electrode in QDSSCs.
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