Abstract
We demonstrate that a GaN nanowire array can be used for efficient charge transfer between the organic photovoltaic layer and silicon in a Si/GaN/P3HT:PC71BM inverted hybrid heterostructure. The band alignment of such a material combination is favorable to facilitate exciton dissociation, carrier separation and electron transport into Si. The ordered nature of the GaN array helps to mitigate the intrinsic performance limitations of the organic active layer. The dependence of photovoltaic performance enhancement on the morphology of the nanostructure with nanowire diameters 30, 50, 60, 100 and 150 nm was studied in detail. The short circuit current was enhanced by a factor of 4.25, while an open circuit voltage increase by 0.32 volts was achieved compared to similar planar layers.
Highlights
Hybrid organic–inorganic solar cells based on inorganic nanowires (NWs) embedded in photosensitive polymer films have been the focus of research on ways to enhance the power conversion efficiency of bulk heterojunction (BHJ) organic photovoltaic cells by the simultaneous application of several strategies: enhanced light absorption by NW arrays, improved charge separation, carrier collection and transport in inorganic acceptors [1,2]
These data could be useful for hybrid solar cell design, especially in the context of Materials by plasma-assisted molecular beam epitaxy (PAMBE) technique using Riber Compact21 creating the top cell in a Si-based multilayer structure or using bulk silicon to recover non-absorption reactor equipped with the standard Knudsen gallium cell
Thesurface photocurrent sho for self-assembled PAMBE GaN NWs on silicon embedded into P3HT:PC71 BM are found to be equal a maximum for NW diameter d = 50 nm, after which it starts to decline as potential photocurr to 0.6 and 2.8, respectively
Summary
Hybrid organic–inorganic solar cells based on inorganic nanowires (NWs) embedded in photosensitive polymer films have been the focus of research on ways to enhance the power conversion efficiency of bulk heterojunction (BHJ) organic photovoltaic cells by the simultaneous application of several strategies: enhanced light absorption by NW arrays, improved charge separation, carrier collection and transport in inorganic acceptors [1,2]. One of the most researched light-sensitive polymers, the poly(3-hexylthiophene-2,5-diyl) in mixture with [6,6]-Phenyl C71 butyric acid methyl ester acceptor, commonly referred to as P3HT:PC71 BM, has been a workhorse for organic photovoltaics research due to its light absorption properties and optimum band gap of 1.9 eV [3]. The energetic difference between the lowest unoccupied molecular orbital (LUMO) of P3HT
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