EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 3BV.1.22 Promising Route Towards Scalable Perovskite Top Cell for Perovskite/ c-Si Tandem Photovoltaics
Type: Visual
Date: Tuesday, 7th September 2021
08:30 - 10:00
Author(s): S.-T. Zhang, V.-S. Nguyen, I. Zimmermann, O. Fournier, D. Coutancier, T. Vincent, A. Duchatelet, J. Rousset, N. Schneider
Presenter / Speaker: S.-T. Zhang, IPVF, Palaiseau, France
Event: Conference Conference
Session: 3BV.1 Perovskite Solar Cells and Modules
Topic: 3. 1 Perovskites
Summary / Abstract: In the past decade, perovskite solar cells (PSCs) have revolutionized the photovoltaic (PV) community, with its efficiency skyrocketing to over 25% (single junction), in par with the highest performing c-Si and GaAs solar cells.1 Furthermore, the large band gap of PSC makes it a suitable top cell to be combined with c-Si bottom cell to form tandem structure to achieve even higher efficiency. In the case of monolithic two-terminal perovskite/Si tandem devices, the textured (for the purpose of better light trapping) Si bottom cell makes it challenging to grow the successive perovskite top cell. The traditional techniques to deposit transport layers such as spin-coating do not allow a conformal deposition on the textured silicon bottom cell. On the other hand, physical deposition techniques such as sputtering usually require high thermal budget and plasma which can damage the perovskite layer. Atomic layer deposition (ALD) is an up-scalable technique that allows conformal deposition on structures of high aspect ratio with fine tuning of thickness and material properties at soft conditions (low temperature etc.).2 In this work, SnO2 thin films were developed by ALD, which is shown to conformally cover the textured Si bottom cell. We demonstrate the large-area (15×15 cm2) deposition of SnO2 thin film by ALD and its integration as electron transport layer (ETL) in perovskite solar cells both on cell and mini-module levels. Different strategies have been proposed to passivate the interface between perovskite and ALD-grown SnO2 ETL and their influences on the device performance will be discussed in detail. Our work highlights a promising approach to grow large-area high-quality perovskite top cell on textured Si bottom cell for monolithic twoterminal tandem applications.3