Open AccessNumerical optical optimization of monolithic planar perovskite-silicon tandem solar cells with regular and inverted device architectures
Author(s) -
Klaus Jäger,
Lars Korte,
Bernd Rech,
Steve Albrecht
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.00a473
Subject(s) - tandem , materials science , photocurrent , optoelectronics , silicon , common emitter , planar , energy conversion efficiency , heterojunction , perovskite (structure) , optics , computer science , physics , computer graphics (images) , composite material , chemical engineering , engineering
We numerically maximize the achievable photocurrent density of planar perovskite-silicon tandem solar cells for different device architectures. For the optimizations we combine the transfer-matrix method with a simulated annealing algorithm. The optimizations are conducted within experimentally accessible and relevant layer-thickness ranges, which allows to extract applicable device guidelines. A comparison between regular and inverted tandem-cell designs reveals that a rear-emitter silicon heterojunction in combination with an inverted perovskite top-cell can yield a photocurrent, which is 1.4 mA/cm 2 higher than that of tandem cells with the usual polarity and a front-emitter silicon bottom cell. Switching from the regular to the inverse architecture leads to over 2% (absolute) gain in power conversion efficiency. Finally we show that an efficiency of 30.8% is achievable for such tandem cells with an optimized perovskite band-gap.