Alkali Lithium Metal Doping Effects on Mesoporous TiO2 Electron Transport Layer Based CH3NH3PbI3 Perovskite Solar Cells
Amalraj Peter Amalathas a, Lucie Landová a b, Brianna Conrad a, Jakub Holovský a b
a Centre for Advanced Photovoltaics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague, Czech Republic
b Institute of Physics, Czech Academy of Sciences, v. v. i., Cukrovarnická 10, 162 00 Prague, Czech Republic
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Amalraj Peter Amalathas, 213
Publication date: 11th February 2019

The electron transport layer(ETL), one of the most vital components for high performing perovskite solar cells (PSCs), plays an important role in extracting the photogenerated electrons from perovskite and transporting these charges to electrodes and simultaneously assists as a hole blocking layer to suppress charge recombination. In general, TiO2 is most commonly employed as an ETL in PSCs due to the fast electron injection rates from perovskite to TiO2, easy fabrication, non-toxicity, and chemical stability [1]. However, the low electron mobility and transport properties may influence a negative impact on device performance[2]. The electronic properties of TiO2 can be modified in an efficient way by doping with one or more other elements such as alkali metals, non-metals, metalloids, transition metals, post-transition metals, and lanthanides [3].

In this work, we report on the effect of alkali Lithium metal doping of mesoporous TiO2 used as an ETL in the CH3NH3PbI3 PSCs. The surface morphology, optical properties, charge carrier dynamic, electron mobility, electrical conductivity, photovoltaic performance and hysteresis behavior of various lithium concentration of mesoporous TiO2 were systematically investigated. The experimental results indicate that the improved electron carrier extraction and collection efficiency, reduced electronic trap states, and higher electron mobility contribute to the superior performance of the PSCs utilizing Lithium-doped mesoporous TiO2. The power conversion efficiency (PCE) of the PSC was significantly enhanced from 13.64 % to 17.59 % with an optimized lithium doping concentration of 30mg/ml while reducing the J-V curve hysteresis behavior.

© Fundació Scito
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info