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Passivation strategies for improving the performance and stability of tandem silicon/perovskite solar cells

Technological challenge: Solar energy for energy transition (learn more)

Department: Département des Technologies Solaires (LITEN)

Laboratory: Laboratoire des Cellules Tandem

Start Date: 01-09-2022

Location: Grenoble

CEA Code: SL-DRT-22-0691

Contact: stephane.cros@cea.fr

Hybrid organic-inorganic perovskites (HOIPs) have become one of the most promising photovoltaic technologies in the last decade, paving the way for the development of efficient and cost-effective solar panels. Presently, the certified record efficiency obtained for laboratory scale, single-junction, perovskite solar cell (PSC) is 25.5% and 29,5% if combined with silicon solar cells (tandem architecture). The CEA laboratory of Tandem Solar Cells (LCT) in INES institute develops tandem solar cells combining silicon and perovskites technologies. One of the major bottleneck is the stability of the Perovskite sub-cell. Indeed, the ionic nature of the Perovskite absorber leads to ions migration which impacts negatively the electrical behavior of the cells and results in a decrease of performances under illumination. The quality of the interfaces between the different layers constituting the Perovskite sub-cells and the connection with the silicon sub-cell is one of the key factor to reduce the unstability of the tandem cells in operation. Different strategies, named ?passivation?, are developed in order to improve the interfacial quality. This interface engineering thanks to passivation can be performed by different deposition techniques. The aim of this PhD is to investigate some of the passivation strategies available in the laboratory and to study the impact regarding the stability of the cells under different stresses (illumination, temperature, humidity).

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