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Light Trapping in Silicon Based Tandem Solar Cell
Sk Md Iftiquar,Hyeongsik Park,Vinh Ai Dao,Duy Phong Pham,Junsin Yi 한국태양광발전학회 2016 Current Photovoltaic Research Vol.4 No.1
Among the various types of solar cells, silicon based two terminal tandem solar cell is one of the most popular one. It is designed to split the absorption of incident AM1.5 solar radiation among two of its component cells, thereby widening the wavelength range of external quantum efficiency (EQE) spectra of the device, in comparison to that of a single junction solar cell. In order to improve the EQE spectra further and raise short circuit current density (Jsc) an optimization of the tradeoff between the top and bottom cell is needed. In an optimized cell structure, the Jsc and hence efficiency of the device can further be enhanced with the help of light trapping scheme. This can be achieved by texturing front and back surface as well as a back reflector of the device. In this brief review we highlight the development of light trapping in the silicon based tandem solar cell.
Diode Equivalent Parameters of Solar Cell
Iftiquar, Sk Md,Dao, Vinh Ai,Yi, Junsin Korea Photovoltaic Society 2015 Current Photovoltaic Research Vol.3 No.4
Current characteristic curve of an illuminated solar cell was used to determine its reverse saturation current density ($J_0$), ideality factor (n) and resistances, by using numerical diode simulation. High efficiency amorphous silicon, heterojunction crystalline Si (HIT), plastic and organic-inorganic halide perovskite solar cell shows n=3.27 for a-Si and n=2.14 for improved HIT cell as high and low n respectively, while the perovskite and plastic cells show n=2.56 and 2.57 respectively. The $J_0$ of these cells remain within $7.1{\times}10^{-7}$ and $1.79{\times}10^{-8}A/cm^2$ for poorer HIT and improved perovskite solar cell respectively.
Improving Device Efficiency for n-i-p Type Solar Cells with Various Optimized Active Layers
Iftiquar, Sk Md,Yi, Junsin The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.2
We investigated n-i-p type single junction hydrogenated amorphous silicon oxide solar cells. These cells were without front surface texture or back reflector. Maximum power point efficiency of these cells showed that an optimized device structure is needed to get the best device output. This depends on the thickness and defect density ($N_d$) of the active layer. A typical 10% photovoltaic device conversion efficiency was obtained with a $N_d=8.86{\times}10^{15}cm^{-3}$ defect density and 630 nm active layer thickness. Our investigation suggests a correlation between defect density and active layer thickness to device efficiency. We found that amorphous silicon solar cell efficiency can be improved to well above 10%.
Present Status and Prospects of Thin Film Silicon Solar Cells
Iftiquar, Sk Md,Park, Jinjoo,Shin, Jonghoon,Jung, Junhee,Bong, Sungjae,Dao, Vinh Ai,Yi, Junsin Korea Photovoltaic Society 2014 Current Photovoltaic Research Vol.2 No.2
Extensive investigation on silicon based thin film reveals a wide range of film characteristics, from low optical gap to high optical gap, from amorphous to micro-crystalline silicon etc. Fabrication of single junction, tandem and triple junction solar cell with suitable materials, indicate that fabrication of solar cell of a relatively moderate efficiency is possible with a better light induced stability. Due to these investigations, various competing materials like wide band gap silicon carbide and silicon oxide, low band gap micro-crystalline silicon and silicon germanium etc were also prepared and applied to the solar cells. Such a multi-junction solar cell can be a technologically promising photo-voltaic device, as the external quantum efficiency of such a cell covers a wider spectral range.
Light Trapping in Silicon Based Tandem Solar Cell: A Brief Review
Iftiquar, Sk Md,Park, Hyeongsik,Dao, Vinh Ai,Pham, Duy Phong,Yi, Junsin Korea Photovoltaic Society 2016 Current Photovoltaic Research Vol.4 No.1
Among the various types of solar cells, silicon based two terminal tandem solar cell is one of the most popular one. It is designed to split the absorption of incident AM1.5 solar radiation among two of its component cells, thereby widening the wavelength range of external quantum efficiency (EQE) spectra of the device, in comparison to that of a single junction solar cell. In order to improve the EQE spectra further and raise short circuit current density ($J_{sc}$) an optimization of the tradeoff between the top and bottom cell is needed. In an optimized cell structure, the $J_{sc}$ and hence efficiency of the device can further be enhanced with the help of light trapping scheme. This can be achieved by texturing front and back surface as well as a back reflector of the device. In this brief review we highlight the development of light trapping in the silicon based tandem solar cell.
Diode Equivalent Parameters of Solar Cell
Sk Md Iftiquar,Vinh Ai Dao,Junsin Yi 한국태양광발전학회 2015 Current Photovoltaic Research Vol.3 No.4
Current characteristic curve of an illuminated solar cell was used to determine its reverse saturation current density (J0), ideality factor (n) and resistances, by using numerical diode simulation. High efficiency amorphous silicon, heterojunction crystalline Si(HIT), plastic and organic-inorganic halide perovskite solar cell shows n=3.27 for a-Si and n=2.14 for improved HIT cell as high and low n respectively, while the perovskite and plastic cells show n=2.56 and 2.57 respectively. The J0 of these cells remain within 7.1×10<SUP>-7</SUP> and 1.79×10<SUP>-8</SUP> A/㎠ for poorer HIT and improved perovskite solar cell respectively.
Present Status and Prospects of Thin Film Silicon Solar Cells
Sk Md Iftiquar,Jinjoo Park,Jonghoon Shin,Junhee Jung,Sungjae Bong,Vinh Ai Dao,Junsin Yi 한국태양광발전학회 2014 Current Photovoltaic Research Vol.2 No.2
Extensive investigation on silicon based thin film reveals a wide range of film characteristics, from low optical gap to high optical gap, from amorphous to micro-crystalline silicon etc. Fabrication of single junction, tandem and triple junction solar cell with suitable materials, indicate that fabrication of solar cell of a relatively moderate efficiency is possible with a better light induced stability. Due to these investigations, various competing materials like wide band gap silicon carbide and silicon oxide, low band gap micro-crystalline silicon and silicon germanium etc were also prepared and applied to the solar cells. Such a multi-junction solar cell can be a technologically promising photo-voltaic device, as the external quantum efficiency of such a cell covers a wider spectral range.
Baek, Seungsin,Lee, Jeong Chul,Lee, Youn-Jung,Iftiquar, Sk Md,Kim, Youngkuk,Park, Jinjoo,Yi, Junsin Springer 2012 NANOSCALE RESEARCH LETTERS Vol.7 No.1
<P>Aluminum-doped zinc oxide (ZnO:Al) [AZO] is a good candidate to be used as a transparent conducting oxide [TCO]. For solar cells having a hydrogenated amorphous silicon carbide [a-SiC:H] or hydrogenated amorphous silicon [a-Si:H] window layer, the use of the AZO as TCO results in a deterioration of fill factor [FF], so fluorine-doped tin oxide (Sn0<SUB>2</SUB>:F) [FTO] is usually preferred as a TCO. In this study, interface engineering is carried out at the AZO and p-type a-SiC:H interface to obtain a better solar cell performance without loss in the FF. The abrupt potential barrier at the interface of AZO and p-type a-SiC:H is made gradual by inserting a buffer layer. A few-nanometer-thick nanocrystalline silicon buffer layer between the AZO and a-SiC:H enhances the FF from 67% to 73% and the efficiency from 7.30% to 8.18%. Further improvements in the solar cell performance are expected through optimization of cell structures and doping levels.</P>