Journal ArticleDOI
Titanium dioxide/silicon hole-blocking selective contact to enable double-heterojunction crystalline silicon-based solar cell
Ken Nagamatsu,Sushobhan Avasthi,Girija Sahasrabudhe,Gabriel Man,Janam Jhaveri,Alexander H. Berg,Jeffrey Schwartz,Antoine Kahn,Sigurd Wagner,James C. Sturm +9 more
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TLDR
In this paper, an electron-selective titanium dioxide (TiO2) heterojunction contact to silicon is used to block minority carrier holes in the silicon from recombining at the cathode contact of a silicon-based photovoltaic device.Abstract:
In this work, we use an electron-selective titanium dioxide (TiO2) heterojunction contact to silicon to block minority carrier holes in the silicon from recombining at the cathode contact of a silicon-based photovoltaic device. We present four pieces of evidence demonstrating the beneficial effect of adding the TiO2 hole-blocking layer: reduced dark current, increased open circuit voltage (VOC), increased quantum efficiency at longer wavelengths, and increased stored minority carrier charge under forward bias. The importance of a low rate of recombination of minority carriers at the Si/TiO2 interface for effective blocking of minority carriers is quantitatively described. The anode is made of a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) heterojunction to silicon which forms a hole selective contact, so that the entire device is made at a maximum temperature of 100 °C, with no doping gradients or junctions in the silicon. A low rate of recombination of minority carriers at the Si/TiO2 interface is crucial for effective blocking of minority carriers. Such a pair of complementary carrier-selective heterojunctions offers a path towards high-efficiency silicon solar cells using relatively simple and near-room temperature fabrication techniques.read more
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High-efficiency crystalline silicon solar cells: status and perspectives
TL;DR: In this article, the authors review the dynamic field of crystalline silicon photovoltaics from a device-engineering perspective and give an up-to-date summary of promising recent pathways for further efficiency improvements and cost reduction employing novel carrierselective passivating contact schemes, as well as tandem multi-junction architectures, in particular those that combine silicon absorbers with organic-inorganic perovskite materials.
Journal ArticleDOI
Efficient silicon solar cells with dopant-free asymmetric heterocontacts
James Bullock,Mark Hettick,Mark Hettick,Jonas Geissbühler,Alison J. Ong,Alison J. Ong,Thomas Allen,Carolin M. Sutter-Fella,Carolin M. Sutter-Fella,Teresa Chen,Hiroki Ota,Hiroki Ota,Ethan W. Schaler,Stefaan De Wolf,Christophe Ballif,Andres Cuevas,Ali Javey,Ali Javey +17 more
TL;DR: In this paper, the dopant-free electron and hole carrier-selective heterocontacts using alkali metal fluorides and metal oxides, respectively, in combination with passivating intrinsic amorphous silicon interlayers, were successfully developed and implemented.
Journal ArticleDOI
Passivating contacts for crystalline silicon solar cells
TL;DR: De Wolf et al. as mentioned in this paper reviewed the fundamental physical processes governing contact formation in crystalline silicon (c-Si) and identified the role passivating contacts play in increasing c-Si solar cell efficiencies beyond the limitations imposed by heavy doping and direct metallization.
Journal ArticleDOI
Transition metal oxides as hole-selective contacts in silicon heterojunctions solar cells
Luis G. Gerling,Somnath Mahato,Anna Belen Morales-Vilches,Gerard Masmitja,Pablo Ortega,Cristobal Voz,Ramon Alcubilla,Joaquim Puigdollers +7 more
TL;DR: In this paper, a comparative study comprising three transition metal oxides, MoO3, WO3 and V2O5, acting as front p-type contacts for n-type crystalline silicon heterojunction solar cells was performed.
References
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The physics of solar cells
TL;DR: In this article, the p-n junction Monocrystalline solar cells and thin film solar cells managing light over the limit: Strategies for Higher Efficiency are discussed. And the basic principles of PV Electrons and Holes in Semiconductors Generation and Recombination Junctions Analysis of the P-n Junction Mon-Cylindrical Solar Cells
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Solar Cells: Operating Principles, Technology, and System Applications
TL;DR: In this paper, the solar source of light energy is described and quantified, along with a review of semiconductor properties and the generation, recombination, and the basic equations of photovoltaic device physics.
Journal ArticleDOI
Achievement of More Than 25% Conversion Efficiency With Crystalline Silicon Heterojunction Solar Cell
Keiichiro Masuko,Masato Shigematsu,Taiki Hashiguchi,Daisuke Fujishima,Motohide Kai,Naoki Yoshimura,Tsutomu Yamaguchi,Yoshinari Ichihashi,Takahiro Mishima,Naoteru Matsubara,Tsutomu Yamanishi,Tsuyoshi Takahama,Mikio Taguchi,Eiji Maruyama,Shingo Okamoto +14 more
TL;DR: In this article, the structure of an interdigitated back contact was adopted with crystalline silicon heterojunction solar cells to reduce optical loss from a front grid electrode, a transparent conducting oxide (TCO) layer, and a-Si:H layers as an approach for exceeding the conversion efficiency of 25%.
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Semiconductor device fundamentals
TL;DR: Semiconductor Models -- A General Introduction, Field Effect Introduction -- the J-FET and MESFET, and Electrostatics -- Mostly Qualitative Formulation.
Journal ArticleDOI
Enhancement of electrical conductivity of poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) by a change of solvents
TL;DR: In this paper, the authors measured the DC conductivity of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(4-styrenesulfonate) (PSS) with various organic solvents.