A new record efficiency of the perovskite solar cell has been published in the 2014 NREL chart, at 17.9% power conversion efficiency. This solar cell was made by researchers at KRICT Institute in Daejeon, South Korea, that appear in the picture below.
Seok’s group has been producing outstanding results on this field. Yesterday they published a paper in EES in which they present a 1.4 V solar cell. High voltage perovskite solar cells were demonstrated before by Gary Hodes, but the Korean group shows 6.7% efficiency, which makes this cell a rather competitive candidate for large voltage applications. Note that a single cell is close to the voltage of a standard AAA battery…
It is also important to point out that this paper shows that the photovoltage in perovskite solar cells is determined by the separation of Fermi levels in the absorber, as in most solar cells, and not by the difference of workfunction of the contacts. Those who wish to understand, understand.
S. Ryu, J. H. Noh, N. J. Jeon, Y. C. Kim, W. S. Yang, J. W. Seo and S. I. Seok, Energy Environ. Sci., 2014, DOI:10.1039/C4EE00762J.