English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Thin-film solar cells reach high efficiencies and have a low carbon footprintin production. Tandem solar cells have the potential to significantly increasethe efficiency of this technology, where the bottom-cell is generally composedof a Cu(In,Ga)Se2 absorber layer with bandgaps around 1 eV or higher. Here, weinvestigate CuIn(Se1-xTex)2 absorber layers and solar cells with bandgaps below1 eV, which will bring the benefit of an additional degree of freedom fordesigning current-matched 2-terminal tandem devices. We report thatCuIn(Se1-xTex)2 thin films can be grown single phase by co-evaporation and thatthe bandgap can be reduced to the optimum range for a bottom cell (0.92 - 0.95eV). From photoluminescence spectroscopy it is found that no additionalnon-radiative losses are introduced to the absorber. However, Voc losses occurin the final solar cell due to non-optimised interfaces. Nevertheless, a recorddevice with 9 % power conversion efficiency is demonstrated with a bandgap of0.96 eV and x=0.15. Interface recombination is identified as a majorrecombination channel for larger Te contents. Thus, further efficiencyimprovements are anticipated for improved absorber/buffer interfaces.

CuIn(Se,Te)2 absorbers with bandgaps < 1 eV for bottom cells in tandem applications