Coral-Like Cose2-Nitrogen-Doped Porous Carbon As Efficient Counter Electrodes For Quantum Dot Sensitized Solar Cells
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY(2021)
摘要
Exploration of counter electrode (CE) catalysts with excellent reduction activity to S-n (2-) and low charge transfer resistance (R (ct)) is always a major challenge for the development of quantum dot sensitized solar cells. In this work, coral-like CoSe2 - nitrogen-doped porous carbon hydrides (CoSe2-NC) were successfully prepared by two-step calcination of zeolitic imidazolate framework (ZIF), including carbonization and selenization process. Scanning electron microscopy shows that the CoSe2-NC catalyst presents a coral-like microscopic morphology composed of nanospheres. Electrochemical impedance spectroscopy displays that the CoSe2-NC CE presents a low R (ct) of 1.04 omega. The PCE of the QDSSC based CoSe2-NC CE is up to 5.06%?which is 26%, 87% higher than those of CoSe2 and NC CEs. The enhanced photovoltaic performance is attributed to the unique coral-like structure and the synergistic catalytic effect of CoSe2 and NC.
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