Publication date: 6th November 2020
In order to improve the efficiency and simplify the fabrication method of carbon electrode for planar perovskite solar cells (C-PSCs), a simple yet effective method based on hot-pressing has been developed to press a free-standing carbon film onto adjacent hole transport layer (HTL). The conductivity of the carbon electrode was found to be enhanced by over ten-fold and the adhesion between carbon film and HTL be dramatically strengthened resulted from thermoplasticity of as-prepared carbon film. An optimised pressing temperature (80℃) was applied to the fabrication process achieving 15.3% of photocurrent conversion efficiency (PCE) for CuSCN-based C-PSCs. The PCE is 70% higher than the device without heating at the same pressing pressure. After being stored in a humid environment (55-70%) without encapsulation over 80 days, the device still demonstrated 93% performance retention. Therefore, this facile fabrication process of C-PSCs paves a way to facilitate commercialisation of the new PV technology.
The authors thanks the financial support by Australian Research council (ARC) through a discovery project (DP190102252)
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