EU PVSEC Programme Online
EU PVSEC 2021, 6 - 10 September 2021
Presentation: 3AO.5.2 How to Make PERC Suitable for Perovskite-Silicon Tandem Solar Cells: A Simulation Study
Type: Oral
Date: Monday, 6th September 2021
15:15 - 16:45
Author(s): C. Messmer, J. Schön, S. Lohmüller, J. Greulich, C. Luderer, J.C. Goldschmidt, M. Bivour, S.W. Glunz, M. Hermle
Presenter / Speaker: C. Messmer, Fraunhofer ISE, Freiburg, Germany
Event: Conference Conference
Session: 3AO.5 Tandem Solar Cells Process and Performance
Topic: 3. 5 Tandems
Summary / Abstract: As silicon solar cells are about to reach their efficiency limit, the interest in tandem application is strong, especially for perovskite- silicon tandem solar cells featuring higher efficiencies at potentially low costs [1, 2]. A recent study has shown that the race for the best silicon bottom cell is still open to all investigated technologies [3]. Consequently, the PERC technology as the current industrial standard is a very promising option to evolve into a low-cost tandem device. However, the pathway towards an optimized tandem device based on PERC technology (Pero-PERC) needs to be further investigated, which among other factors includes the phosphorus-diffused front emitter and the interconnection layers towards the top cell. While the standard PERC emitters were optimized regarding short wavelengths transparency [4], surface passivation, lateral transport towards the metal contacts, and low recombination and contact resistance at the screen-printed silver contacts, and gettering of impurities; the design trade-off of the front side of the PERC bottom cell follows different optical and electrical requirements: Only long wavelength photons are absorbed, only half the current flows, no lateral transport in the emitter and no (thermal budget for the) firing-though of the local silver contacts is needed. Consequently, to make PERC suitable for tandem application, a systematic reevaluation of the current PERC technology is necessary.