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Nano-mirror embedded back reflector layer (BRL) for advanced light management in thin silicon solar cells
摘要： This work illustrates a technology for advanced light management by introducing a nonconventional back reflector layer (BRL) in amorphous silicon (a-Si:H) solar cells. To meet this, silver sulfide (Ag2S) nanoparticles with ~50 nm diameter have been chosen as the nano-mirror owing to its low parasitic absorption loss over a broad wavelength (300 to 1100 nm) region. The Ag2S NPs were sandwiched between two indium tin oxide (ITO) layer and placed as the back reflector layer of an a-Si:H solar cell to achieve better light trapping within the active layers. The embedded structure exhibited high reflectance (up to 93%) in the red and near-infrared region, the main working zone of a-Si:H cells. With the incorporation of such state of the art back reflector structure in a-Si:H solar cells, a photo-conversion efficiency of 10.58% has been achieved; which is one of the best in this class.
关键词： a-Si:H solar cell,Back reflection,theoretical validation,high efficiency,nano-mirror
更新于2025-11-21 11:01:37
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Optimization of back ITO layer as the sandwiched reflector for exploiting longer wavelength lights in thin and flexible (30?μm) single junction c-Si solar cells
摘要： Fabrication of thin and ?exible crystalline silicon solar cells based on single junction concept is reported with detailed investigations on each step of the production ?ow chain. With the aim of minimizing material use/wastage as per the international technology roadmap for photovoltaic (ITRPV), which is also directly related to the device cost, e?orts have been made to introduce thin (~30 μm) c-Si wafers instead of a conventional 180 μm wafer to fabricate single-junction solar cells. Due to the introduction of thin (~30 μm) c-Si wafer, the device becomes ?exible, which is also an additional bene?t towards the development of future roll-to-roll electronics. In order to address better carrier collection in thin silicon as well as light management, measures have been taken by introducing an indium tin oxide (ITO) layer both on top and at the bottom. The in?uence of this ITO layer along with back Al contact toward the cell e?ciency has been discussed. X-ray di?raction (XRD) analysis has been carried out to investigate microstrain and dislocation density related changes in the thin wafer, which are known to have in?uence on the photoconversion e?ciency. Under 1 Sun illumination, current – voltage characteristics and external quantum e?ciency were measured and found to be promising.
关键词： Sandwiched back ITO layer,Theoretical validation,Single junction,Thin silicon solar cells,Monocrystalline Si
更新于2025-09-16 10:30:52