ABSTRACT
The bandgap tunability and the superior optical absorption of perovskite thin films make them ideal candidates for tandem solar cells. Indium tin oxide remains a popular choice for transparent conductive electrode although it is absent in the perovskite/perovskite tandem as reported in which uses a small molecular weight, sublimable organic semiconductors as carrier selective transport layers. The use of carrier transport layer with a refractive index closely matched to the perovskite will also reduce the reflection losses. In the case of silicon (Si)/Perovskite tandem where multiple bounces maximize the long wavelength absorption in the indirect bandgap Si material, a rear reflector in conjunction with textured surface will be desired. Depositing thin film perovskite solar cell on textured Si cell is one option. The lifetime of perovskite solar cells match those of incumbent photovoltaic technologies for the extra cost of fabricating multi-junctions to be recouped thereby, effectively reducing the levelized cost of energy.
