Nanotextured Perovskite/Silicon Tandem Solar Cell with 29.8% Efficiency
Hosted By: Optics for Energy Technical Group
22 September 2022 8:00 - 9:00
Eastern Time (US & Canada) (UTC -05:00)Perovskite/Silicon tandem solar cells recently gained large attention as they enable power conversion efficiencies (PCE) beyond the physical limit of market-dominating silicon single-junction solar cells. So far, the highest tandem PCE were obtained using fully planar solution-processed perovskite layers, although textured interfaces are regarded as crucial for a broadband reduction of reflection.
In this webinar hosted by the Optics for Energy Technical Group, Prof. Christiane Becker will discuss the story behind monolithic perovskite/silicon tandem solar cells with a "gentle" periodically nanotextured interface between the silicon bottom cell and the solution-processed perovskite top cell, recently achieving certified 29.80% PCE (world record as of 24 May 2022). These devices exhibit a significant reflection reduction (-0.5mA/cm2 current density equivalent) compared to devices with planar perovskite-silicon interface and combined short-circuit current densities in perovskite and silicon of up to 40mA/cm2. Surprisingly, there are further improvements in addition to the optical gain: a statistically significant increase of open-circuit voltage by +15mV is observed and strongly increased production yield from 50% (planar) to 95% (nanotextured) owing to excellent perovskite film formation properties on the nanotextured silicon bottom cells. The webinar contains a critical evaluation of "nanooptical" concepts in solar cell devices supported by optical simulations using the finite-element-method and Bayesian optimization algorithms and sketches.
Subject Matter Level: Introductory - Assumes little previous knowledge of the topic
What You Will Learn:
- Light management, electronic material properties, and film formation nanostructure means for solar cell performance improvement
- Interesting features of light management "nanophotonic" structures and comparison to the performance of random structures
Who Should Attend:
- Anybody interested in world record perovskite/silicon tandem solar cell device
- Students and researchers interested in nanostructures in solar cell devices
About the Presenter: Christiane Becker, Helmholtz-Zentrum Berlin für Materialien und Energie
Prof. Dr. Christiane Becker received her Physics Diploma in 2002 from the University of Heidelberg, Germany and her PhD in 2006 from the University of Karsruhe in the field of Photonic Crystals. After that she joint the Solar Energy Division of Helmholtz-Zentrum Berlin, Germany, first as PostDoc, later on as Young Investigator Group leader and since 2020 as head of Department Optics for Solar Energy. In 2017 she was guest scientist at Lund University in Sweden. Since 2014 she is Professor for Experimental Physics the University of Applied Science HTW Berlin. Her research interest are light management in solar cell devices, photonic nanostructures, spectral conversion and energy yield calculations for solar power plants.
