Products Cited in Publications Worldwide Open-circuit voltage improvement of wide-bandgap perovskite solar cells

Open-circuit voltage improvement of wide-bandgap perovskite solar cells

Ying, Xingjian

DOI:

Abstract

To make photovoltaic technology more competitive in the market, the levelized cost of electricity (LCOE) must be sufficiently low. Currently, other costs of the solar system dominate the price, instead of modules, so that making improvements in efficiency of solar cells becomes an effective way for further lowering LCOE. While single-junction solar cells have nearly reached their efficiency limits, tandem structures have become a practical choice. Perovskite is a promising material to serve as the wide-bandgap component in tandem devices. However, open-circuit voltage (VOC) of wide-bandgap perovskite solar cells still suffers from a significant deficit. In this thesis, perovskite/C60 interface is identified as a major source of additional non-radiative recombination. Sub-bandgap states could form after perovskite contact with C60, leading to additional recombination losses. Insertion of a thin interlayer helps passivate the perovskite surface and reduce non-radiative recombination at the interface, resulting in device VOC up to 1.284 V for 1.67-eV-perovskites.

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