Establishing the limits of efficiency of perovskite solar cells from first principles modeling.

Abstract:

:The recent surge in research on metal-halide-perovskite solar cells has led to a seven-fold increase of efficiency, from ~3% in early devices to over 22% in research prototypes. Oft-cited reasons for this increase are: (i) a carrier diffusion length reaching hundreds of microns; (ii) a low exciton binding energy; and (iii) a high optical absorption coefficient. These hybrid organic-inorganic materials span a large chemical space with the perovskite structure. Here, using first-principles calculations and thermodynamic modelling, we establish that, given the range of band-gaps of the metal-halide-perovskites, the theoretical maximum efficiency limit is in the range of ~25-27%. Our conclusions are based on the effect of level alignment between the perovskite absorber layer and carrier-transporting materials on the performance of the solar cell as a whole. Our results provide a useful framework for experimental searches toward more efficient devices.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Grånäs O,Vinichenko D,Kaxiras E

doi

10.1038/srep36108

subject

Has Abstract

pub_date

2016-11-08 00:00:00

pages

36108

issn

2045-2322

pii

srep36108

journal_volume

6

pub_type

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