High-Voltage Hybrid Organic-Inorganic Perovskite Solar Cells

Perovskite solar cells have emerged as one of the most recent alternatives in photovoltaic (PV) technology. Perovskite refers to a compound with an ABX3 structure; A and B being different sized cations, and X is a bonding anion. Perovskites have a cubic structure that enables different properties, among them solar power conversion efficiency (PCE). Perovskites’ tunable bandgaps make them suitable for tandem perovskite solar cells, either perovskite-perovskite or Si-perovskite. This paper presents the manufacturing process for high-voltage organic-inorganic CH3NH3PbI3−xBrx perovskite solar cells which consists of depositing SnO2, Perovskite, and Spiro OmeTAD layers on top of a glass substrate with transparent contacts on one side (used as the front contact to avoid light blocking, and metal layers on the other side as the back contact. The power conversion efficiency of the perovskite solar cells was obtained through current-voltage (I-V) and external quantum efficiency (EQE) measurements. Perovskite solar cells presented in this paper resulted in high open circuit voltage (Voc) greater than 1 V, a PCE of about to 10%, and external quantum efficiency (EQE) close to 70% throughout most of the visible light spectrum and an energy bandgap of ~1.6 eV.