%0 Journal Article
%A Albrecht, Steve
%A Grootoonk, Björn
%A Neubert, Sebastian
%A Roland, Steffen
%A Wördenweber, Jan
%A Meier, Matthias
%A Schlatmann, Rutger
%A Gordijn, Aad
%A Neher, Dieter
%T Efficient hybrid inorganic/organic tandem solar cells with tailored recombination contacts
%J Solar energy materials & solar cells
%V 127
%@ 0927-0248
%C Amsterdam
%I North Holland
%M FZJ-2014-06488
%P 157 - 162
%D 2014
%X In this work, the authors present a 7.5% efficient hybrid tandem solar cell with the bottom cell made of amorphous silicon and a Si-PCPDTBT:PC70BM bulk heterojunction top cell. Loss-free recombination contacts were realized by combing Al-doped ZnO with either the conducting polymer composite PEDOT:PSS or with a bilayer of ultrathin Al and MoO3. Optimization of these contacts results in tandem cells with high fill factors of 70% and an open circuit voltage close to the sum of those of the sub-cells. This is the best efficiency reported for this type of hybrid tandem cell so far. Optical and electrical device modeling suggests that the efficiency can be increased to ~12% on combining a donor polymer with suitable absorption onset with PCBM. We also describe proof-of-principle studies employing light trapping in hybrid tandem solar cells, suggesting that this device architecture has the potential to achieve efficiencies well above 12%.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000338618000022
%R 10.1016/j.solmat.2014.04.020
%U https://juser.fz-juelich.de/record/173075