Presentation Information
[9a-E217-6]Design guide and evaluation procedures for energy-selective contacts used in hot-carrier solar cells
〇Yasuhiko Takeda1 (1.Toyota Central R&D Labs.)
Keywords:
detailed balance,organic-inorganic-hybrid perovskite
We clarified the optimal combination of the energy levels and conductances of the energy-selective contacts (ESCs) used in hot-carrier solar cells, by detailed-balance-based model calculations. An appropriate value of the conductance for the carrier extraction is required along with an appropriate energy threshold; not only insufficient but also excessively large conductance values lower the conversion efficiency. Nevertheless, the detriment caused by deviation of one of these two characteristic quantities from its optimum is compensated by adjusting the other quantity, providing materials- and device-design guidelines. Whether these two quantities of a given device are appropriate is determined by measuring the relation of the short-circuit current density (jSC) vs. the illumination intensity, which exhibits distinctive signatures. The jSC vs. intensity relation is equivalent to the jSC vs photon-energy relation conventionally evaluated, while being experimentally easier to measure.