Efficiency and Stability Enhancement in Perovskite Solar Cells by Inserting Lithium‐Neutralized Graphene Oxide as Electron Transporting Layer. (5th February 2016)

• Record Type: Journal Article
• Authors: Agresti, Antonio; Pescetelli, Sara; Cinà, Lucio; Konios, Dimitrios; Kakavelakis, George; Kymakis, Emmanuel; Carlo, Aldo Di
• Is Part Of: Advanced functional materials. Volume 26:Number 16(2016)
• Page Start: 2686
• Page End: 2694
• Publication Date: 2016-02-05
• Subjects: electron transport materials (ETM) -- hybrid organic–inorganic perovskite solar cells -- lithium‐neutralized graphene oxide -- photovoltaic devices; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201504949
• Languages: English
• ISSNs: 1616-301X

Abstract

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. Abstract : Lithium‐neutralized graphene oxide (GO‐Li) as electron transporting layer in perovskite solar cells is reported . The proposed device conjugates the extraordinary conduction properties of graphene based materials with the exceptional harvesting behavior of organoleadtrihalide compounds and shows enhanced power conversion efficiency and improved long term stability under operative conditions.