Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
In recent year, fabricating flexible perovskite solar cells (PSC) becomes attractive because of their light weight and bendability. But flexible plastic substrate can’t endure high temperature, which is essential in making PSC on glass substrate. In order to get rid of high temperature process, in this research electrodeposited TiO2 blocking layer (EDBL) and NTB(nano-particle brookite) slurry is used to substitute spin coating and conventional anatase slurry which requires high temperature to remove the binder and impurity.
When using EDBL to replace spin coating, we found the BL is more compact and thinner so that the short circuit current density and fill factor are increased to 19 mA/cm2 and 0.7, respectively, rendering the power conversion efficiency (PSC) boosting from 8% to 13% on glass substrate.
In preparing mesoporous layer, the NTB slurry is able to form a mesoporous film under 150oC heat treatment. Combining EDBL and NTB, plastic PSC made on ITO coated polyethylene naphthalate (ITO-PEN) employing with low temperature process reaches 11.8%. The difference in PCE of plastic and glass PSCs is originated from the deposition bath solution in EDBL, which is too acidic with pH 2.5. ITO coating on PEN is then corroded under this bath. An idea to tune the pH value is proposed and experiment setup is undergoing to overcome this technical issue in developing highly efficient plastic PSC.
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