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Advanced Science, Volume 5, Issue 8, August 2018.

Publication date: Available online 25 June 2018
Source:Joule
Author(s): Dianyi Liu, Chenchen Yang, Richard R. Lunt
Halide perovskite materials have emerged as a potential Si replacement with excellent photovoltaic properties. There has been growing interest in applying halide perovskites to semitransparent and spatially segmented transparent photovoltaics (TPVs) to enable a greater range of deployment routes. However, the continuous-band absorption of these semiconductors prevents near-infrared selective harvesting typically targeted for TPVs with the highest efficiency and transparency needed to meet the aesthetic demands of many potential applications. In this work, we demonstrate TPVs based on perovskite semiconductors where the band gap is sensitively tuned with a range of compositions to selectively harvest only ultraviolet photons with band gaps between 410 and 440 nm. This approach offers theoretical efficiencies up to 7% with >99% visible transparency when precisely targeting band gaps around 435 nm. Practical optimization of these perovskite cells could quickly yield TPVs with power conversion efficiencies rivaling state-of-the-art near-infrared harvesting TPVs today while also providing a route to higher-efficiency multi-junction TPVs.

Graphical abstract

Teaser

UV-harvesting transparent photovoltaic devices with halide perovskite light absorbers are demonstrated. The band gap is sensitively tuned with a range of compositions to selectively harvest only UV photons with band gaps between 410 and 440 nm. This approach offers theoretical efficiencies up to 7% with >99% visible transparency when precisely targeting band gaps around 435 nm. Practical optimization of these perovskite cells could quickly yield TPVs with PCEs rivaling state-of-the-art near-infrared-harvesting TPVs today while also providing a route to higher-efficiency multi-junction TPVs.

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.

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

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

Advanced Functional Materials, Volume 28, Issue 32, August 8, 2018.

Advanced Functional Materials, EarlyView.

Small, Volume 14, Issue 31, August 2, 2018.

Advanced Materials, Volume 30, Issue 31, August 2, 2018.

Advanced Materials, EarlyView.