Chen Weijie

Publication date: Available online 7 June 2018
Source:Joule
Author(s): Terry Chien-Jen Yang, Peter Fiala, Quentin Jeangros, Christophe Ballif
High-bandgap (>1.7 eV) mixed halide perovskites for multijunction solar cells are usually affected by photoinduced phase segregation, which triggers sub-bandgap defects that are detrimental to the open-circuit voltage. While this effect may be reversed, e.g., when leaving the cells in the dark, new perovskite compositions that exhibit enhanced stability may be required. In this Perspective, the compositional space beyond the conventional methylammonium- and formamidinium-based mixed halide compounds is reviewed in light of multijunction applications. These alternative absorber compositions include: (1) layered or quasi-2D perovskites, where larger organic cations are incorporated into the structure; (2) inorganic perovskites (i.e., when the organic components are removed altogether); and (3) lead-free structures, where the toxic lead is substituted by one or more elements. The development perspectives of high-efficiency and stable perovskite materials based on these compositions are discussed in view of an integration in multijunction solar cells.

Graphical abstract

Teaser

High-bandgap perovskites for multijunction solar cells are promising materials for next-generation photovoltaics. However, current mixed halide perovskite materials suffer from a reversible photoinduced phase segregation that is detrimental to open-circuit voltage and most contain the toxic element lead. This Perspective investigates alternative absorber compositions currently under research, including (1) quasi-2D perovskites comprising larger organic cations, (2) inorganic perovskites, and (3) lead-free perovskites. A literature survey of solar cells made with these alternative perovskite absorber compositions is also included.

Advanced Energy Materials, Volume 8, Issue 23, August 16, 2018.

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Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiency

Fully textured monolithic perovskite/silicon tandem solar cells with 25.2% power conversion efficiency, Published online: 11 June 2018; doi:10.1038/s41563-018-0115-4

An optimized two-step deposition process allows the formation of uniform layers of metal halide perovskites on textured silicon layers, enabling tandem silicon/perovskite solar cells with improved optical design and efficiency.

Small, EarlyView.

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Advanced Functional Materials, Volume 28, Issue 31, August 1, 2018.

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