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Vismara, R. (author), Isabella, O. (author), Zeman, M. (author)We present the optical investigation of a novel back-contacted architecture for solar cells based on a thin barium (di)silicide (BaSi<sub>2</sub>) absorber. First, through the analysis of absorption limits of different semiconducting materials, we show the potential of BaSi<sub>2</sub> for photovoltaic applications. Then, the proposed back...journal article 2017
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Si, F.T. (author), Isabella, O. (author), Zeman, M. (author), Tan, H. (author)We fabricated and studied quadruple-junction wide-gap a-Si:H/narrow-gap a-Si:H/a-SiGex:H/nc-Si:H thin-film silicon solar cells. It is among the first attempts in thin-film photovoltaics to make a two-terminal solar cell with four different absorber materials. Several tunnel recombination junctions were tested, and the n-SiOx:H/p-SiOx:H structure...journal article 2017
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Yang, G. (author), Zhang, Y. (author), Procel Moya, P.A. (author), Weeber, A.W. (author), Isabella, O. (author), Zeman, M. (author)Highest conversion efficiency in crystalline silicon (c-Si) solar cells can be enabled by quenching minority carriers' recombination at c-Si/contact interface owing to carrier-selective passivating contacts. With the semi-insulating poly-crystalline silicon (SIPOS, poly-Si) a very good passivation of c-Si surfaces was obtained. We have...journal article 2017
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Si, F.T. (author), Isabella, O. (author), Zeman, M. (author)Mixed-phase hydrogenated silicon oxide (SiOx:H) is applied to thin-film hydrogenated amorphous silicon germanium (a-SiGe:H) solar cells serving as both p-doped and n-doped layers. The bandgap of p-SiOx:H is adjusted to achieve a highly-transparent window layer while also providing a strong electric field. Bandgap grading of n-SiOx:H is designed...journal article 2017
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Melskens, J. (author), Eijt, S.W.H. (author), Schouten, M. (author), Vullers, A.S. (author), Mannheim, Awital (author), Schut, H. (author), Macco, Bart (author), Zeman, M. (author), Smets, A.H.M. (author)The nanostructure of hydrogenated amorphous silicon (a-Si:H) is studied by means of doppler broadening positron annihilation spectroscopy (DB-PAS) and Fourier transform infrared (FTIR) spectroscopy. The evolution of open volume deficiencies is monitored during annealing, demonstrating that small vacancies and other small vacancy clusters that...journal article 2017
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Eijt, S.W.H. (author), Shi, W. (author), Mannheim, A. (author), Butterling, M. (author), Schut, H. (author), Egger, W (author), Dickmann, M. (author), Hugenschmidt, C (author), Shakeri, B. (author), Meulenberg, R.W. (author), Callewaert, V. (author), Saniz, R (author), Partoens, B (author), Barbiellini, B (author), Bansil, A (author), Melskens, J. (author), Zeman, M. (author), Smets, A.H.M. (author), Kulbak, M. (author), Hodes, G. (author), Cahen, D. (author), Brück, E.H. (author)Recent studies showed that positron annihilation methods can provide key insights into the nanostructure and electronic structure of thin film solar cells. In this study, positron annihilation lifetime spectroscopy (PALS) is applied to investigate CdSe quantum dot (QD) light absorbing layers, providing evidence of positron trapping at the...journal article 2017
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Si, F.T. (author), Isabella, O. (author), Zeman, M. (author)The benefit of two-terminal multijunction solar cells in regard to the number<br/>of junctions (subcells) is critically evaluated. The optical and electrical losses<br/>inherent in the construction of multijunction cells are analyzed using information<br/>from thin-film silicon photovoltaics as a representative case. Although<br/>the...journal article 2017
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- Chandra Mouli, G.R. (author), Van Der Meer, Dennis (author), Bauer, P. (author), Zeman, M. (author), Schijffelen, Jos H. (author), van den Heuvel, Mike (author), Kardolus, Menno (author) abstract 2017
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Vasudevan, R.A. (author), Poli, Isabella (author), Deligiannis, D. (author), Zeman, M. (author), Smets, A.H.M. (author)Light-induced effects on the minority carrier lifetime of silicon heterojunction structures are studied through multiple-exposure photoconductance decay (MEPCD). MEPCD monitors the effect of the measurement flash from a photoconductance decay setup on a sample over thousands of measurements. Varying the microstructure of the intrinsic...journal article 2016
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van Sebille, M. (author), Allebrandi, J.S. (author), Quik, J. (author), van Swaaij, R.A.C.M.M. (author), Tichelaar, F.D. (author), Zeman, M. (author)We demonstrate an analytical method to optimize the stoichiometry and thickness of multilayer silicon oxide films in order to achieve the highest density of non-touching and closely spaced silicon nanocrystals after annealing. The probability of a nanocrystal nearest-neighbor distance within a limited range is calculated using the...journal article 2016
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Yang, G. (author), Ingenito, A. (author), Isabella, O. (author), Zeman, M. (author)Ion-implanted poly-crystalline silicon (poly-Si), in combination with a tunnel oxide layer, is investigated as a carrier-selective passivating contact in c-Si solar cells based on an interdigitated back contact (IBC) architecture. The optimized poly-Si passivating contacts enable low interface recombination, resulting in implied VOC (iVOC) of...journal article 2016
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Perez Rodriguez, P. (author), Digdaya, I.A. (author), Mangel Raventos, A. (author), Falkenberg, M. (author), Vasudevan, R.A. (author), Zeman, M. (author), Smith, W.A. (author), Smets, A.H.M. (author)One of the main problems of renewable energies is storage of the energy carrier. For long-term storage, solar fuels seem to be a good option. Direct solar water splitting could play an important role in the production of these solar fuels. One of the main challenges of this process is the charge separation and collection at the interfaces. The...conference paper 2016
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Si, F.T. (author), Isabella, O. (author), Zeman, M. (author)Multijunction solar cells promise higher power-conversion efficiency than the single-junction. With respect to two-terminal devices, an accurate measurement of the spectral response requires a delicate adjustment of the light- and voltage-biasing; otherwise it can result in artifacts in the data and thus misinterpretation of the cell properties....journal article 2016
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Santbergen, R. (author), Mishima, Ryoto (author), Meguro, Tomomi (author), Hino, Masashi (author), Uzu, Hisashi (author), Blanker, A.J. (author), Yamamoto, Kenji (author), Zeman, M. (author)In a monolithic perovskite/c-Si tandem device, the perovskite top cell has to be deposited onto a flat c-Si bottom cell without anti-reflective front side texture, to avoid fabrication issues. We use optical simulations to analyze the reflection losses that this induces. We then systematically minimize these losses by introducing surface...journal article 2016
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Onwudinanti, Chidozie (author), Vismara, R. (author), Isabella, O. (author), Grenet, Louis (author), Emieux, Fabrice (author), Zeman, M. (author)We have used 3-D optical modelling to investigate light management concepts based on periodic textures and material optimization for photovoltaic devices based on Cu(In,Ga)Se2 (CIGS) absorber material. At first, calibration of the software based on the characterization of a reference (1500-nm thick) CIGS device was carried out. The effects of 1...journal article 2016
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Isabella, O. (author), Vismara, R. (author), Ingenito, A. (author), Rezaei, N. (author), Zeman, M. (author)The optical analysis of optically-textured and electrically-flat ultra-thin crystalline silicon (c-Si) slabs is presented. These slabs were endowed with decoupled front titanium-dioxide (TiO2) / back silicon-dioxide (SiO2) dielectric textures and were studied as function of two types of back reflectors: standard silver (Ag) and dielectric...journal article 2016
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Vasudevan, R.A. (author), Poli, I. (author), Deligiannis, D. (author), Zeman, M. (author), Smets, A.H.M. (author)This work adapts a model to simulate the carrier injection dependent minority carrier lifetime of crystalline silicon passivated with hydrogenated amorphous silicon at elevated temperatures. Two existing models that respectively calculate the bulk lifetime and surface recombination velocity are used and the full temperature dependency of...journal article 2016
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Vasudevan, R.A. (author), Thanawala, Zaid (author), Han, L. (author), Tan, H. (author), Buijs, Thom (author), Deligiannis, D. (author), Perez Rodriguez, P. (author), Digdaya, I.A. (author), Smith, W.A. (author), Zeman, M. (author), Smets, A.H.M. (author)A hybrid tandem solar cell consisting of a thin-film, nanocrystalline silicon top junction and a siliconheterojunction bottom junction is proposed as a supporting solar cell for photoelectrochemical applications.Tunneling recombination junction engineering is shown to be an important consideration indesigning this type of solar cell. The best...journal article 2016
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Gao, Y. (author), Dong, J. (author), Isabella, O. (author), Zeman, M. (author), Zhang, G (author)Diverse solar irradiance spectra can be observed under different conditions of time, date, location, weather, etc. Since the solar irradiance spectrum is required by certain scientific and engineering applications, obtaining accurate spectral data is essential. Measurements by spectrophotometers are able to achieve accurate real-time data with...conference paper 2016
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Yang, G. (author), Ingenito, A. (author), van Hameren, Nienke (author), Isabella, O. (author), Zeman, M. (author)Ion-implanted passivating contacts based on poly-crystalline silicon (polySi) are enabled by tunneling oxide, optimized, and used to fabricate interdigitated back contact (IBC) solar cells. Both n-type (phosphorous doped) and p-type (boron doped) passivating contacts are fabricated by ion-implantation of intrinsic polySi layers deposited via low...journal article 2016