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Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer |
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| Authors: | Antonio Agresti Sara Pescetelli Lucio Cinà Dimitrios Konios George Kakavelakis Emmanuel Kymakis Aldo Di Carlo |
| Affiliation: | 1. CHOSE (Centre for Hybrid and Organic Solar Energy), Department of Electronic Engineering, University of Rome Tor Vergata, Rome, Italy;2. Center of Materials Technology and Photonics & Electrical Engineering Department, School of Applied Technology, Technological Educational Institute (T.E.I) of Crete, Heraklion, Crete, Greece |
| Abstract: | This work proposes a new perovskite solar cell structure by including lithium‐neutralized graphene oxide (GO‐Li) as the electron transporting layer (ETL) on top of the mesoporous TiO2 (m‐TiO2) substrate. The modified work‐function of GO after the intercalation of Li atoms (4.3 eV) exhibits a good energy matching with the TiO2 conduction band, leading to a significant enhancement of the electron injection from the perovskite to the m‐TiO2. The resulting devices exhibit an improved short circuit current and fill factor and a reduced hysteresis. Furthermore, the GO‐Li ETL partially passivates the oxygen vacancies/defects of m‐TiO2 by resulting in an enhanced stability under prolonged 1 SUN irradiation. |
| Keywords: | electron transport materials (ETM) hybrid organic– inorganic perovskite solar cells lithium‐neutralized graphene oxide photovoltaic devices |