Back-Contacted Silicon Heterojunction Solar Cells With Efficiency &gt;21%

Tomasi, A.; Paviet‐Salomon, Bertrand; Lachenal, D.; Nicolás, Silvia Martín de; Descoeudres, Antoine; Geissbühler, Jonas; Wolf, Stefaan De; Ballif, Christophe

doi:10.1109/jphotov.2014.2320586

Cited by 72 publications

(59 citation statements)

References 48 publications

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“…J short is dramatically reduced when decreasing the front n-type a-Si:H layer thickness. For instance, replacing the 6-nm-thick n-type a-Si:H layer (featured at the front of the IBC-SHJ device on which we reported in [14]) with no n-layer at all, represents a current gain of ∼1.0 mA/cm 2 . These J short values are consistent with those obtained using OPAL, especially for n-layers thicker than 6 nm.…”

Section: B Mitigation Of Short-circuit Current Losses At the Front Omentioning

confidence: 98%

“…Hot-melt inkjet printing was performed by the commercial system LP50 from Roth & Rau B. V. Finally, the solar cells were cured at 200°C in a belt furnace to heal potentially present sputter-induced damage of the a-Si:H layers [37]. Further experimental details can be found in [14] and [38], especially regarding the low-cost patterning processes we developed.…”

Section: A Interdigitated Back-contacted Silicon Heterojunction Solamentioning

confidence: 99%

“…Detailed analysis of the theoretical limits of J sc in solar cells can be found elsewhere [44], [45]. Table III gives the electrical parameters of two reference FE-SHJ and IBC-SHJ solar cells processed in our laboratory and reported in [24] and [14], respectively. Their EQE, R cell , T cell , and A cell curves are displayed in Fig.…”

Section: Calculation Of Short-circuit Current Lossesmentioning

confidence: 99%

“…First and foremost, two front-side schemes are predominantly featured in such devices: either a-Si:H layers combined with dielectrics-based ARCs [14], [17], [19]- [22] or high-temperature diffused front-surface fields (FSF) combined with ARCs [15], [23]. These two options originate from stacks standardly used in two-side contacted solar cells, usually featured at the front side of both heterojunction [24] and homojunction [25] rear-emitter devices, respectively.…”

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confidence: 99%

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Back-Contacted Silicon Heterojunction Solar Cells: Optical-Loss Analysis and Mitigation

Paviet‐Salomon

Tomasi

Descoeudres

et al. 2015

IEEE J. Photovoltaics

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Abstract-We analyze the optical losses that occur in interdigitated back-contacted amorphous/crystalline silicon heterojunction solar cells. We show that in our devices, the main loss mechanisms are similar to those of two-side contacted heterojunction solar cells. These include reflection and escape-light losses, as well as parasitic absorption in the front passivation layers and rear contact stacks. We then provide practical guidelines to mitigate such reflection and parasitic absorption losses at the front side of our solar cells, aiming at increasing the short-circuit current density in actual devices. Applying these rules, we processed a back-contacted silicon heterojunction solar cell featuring a short-circuit current density of 40.9 mA/cm 2 and a conversion efficiency of 22.0%. Finally, we show that further progress will require addressing the optical losses occurring at the rear electrodes of the back-contacted devices.

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Section: B Mitigation Of Short-circuit Current Losses At the Front Omentioning

confidence: 98%

Section: A Interdigitated Back-contacted Silicon Heterojunction Solamentioning

confidence: 99%

Section: Calculation Of Short-circuit Current Lossesmentioning

confidence: 99%

mentioning

confidence: 99%

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Back-Contacted Silicon Heterojunction Solar Cells: Optical-Loss Analysis and Mitigation

Paviet‐Salomon

Tomasi

Descoeudres

et al. 2015

IEEE J. Photovoltaics

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“…23,33 In such cells, both electrical contacts are placed on the back of the device. As there is no metallization on the front side of the cells, shadowing losses are avoided, leading to enhanced current densities.…”

Section: Technological Outlook and Conclusionmentioning

confidence: 99%

Solar-to-Hydrogen Production at 14.2% Efficiency with Silicon Photovoltaics and Earth-Abundant Electrocatalysts

Schüttauf

Modestino

Chinello

et al. 2016

J. Electrochem. Soc.

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Affordable, stable and earth-abundant photo-electrochemical materials are indispensable for the large-scale implementation of sunlight-driven hydrogen production. Here we present an intrinsically stable and scalable solar water splitting device that is fully based on earth-abundant materials, with a solar-to-hydrogen conversion efficiency of 14.2%. This unprecedented efficiency is achieved by integrating a module of three interconnected silicon heterojunction solar cells that operates at an appropriate voltage to directly power microstructured Ni electrocatalysts. Nearly identical performance levels were also achieved using a customized state-of-the-art proton exchange membrane (PEM) electrolyzer. The past decade has seen an increase in the urgency to substitute fossil fuels with clean and renewable energy sources. Among all of the renewable sources, solar irradiation is undeniably the most prominent option. The average accessible solar power accounts for over ∼120 000 TW globally; 1 several thousand times the current global energy needs.2 Photovoltaic cells can capture this vast energy resource and convert it into usable electrical energy at high efficiencies. Their implementation in the past years has seen a large growth driven by favorable environmental policies and a steady decrease in their production cost. Although the penetration of photovoltaics has been significant, some challenges for their integration into the electricity grid have started to become evident. Mainly, the intermittent nature of the solar electricity production prevents their large-scale grid implementation without compensation mechanisms that satisfy the demand during low-irradiation periods. Adding energy storage capacity to the grid could directly alleviate the fluctuations on power production. Electrochemical energy storage in batteries is already an interesting option for large-scale stationary energy storage. Electrochemical production of hydrogen from excess solar electricity is also an attractive option for storing solar energy in the form of a fuel which could be used at a later stage for electricity production back into the grid or transportation. 3,4 Furthermore, hydrogen can be stored for prolonged periods of time, so that solar resources are harvested during high irradiation periods and used throughout the year. Because of these multiple advantages, solar-to-fuel approaches have attracted a lot of interest in the renewable energy field and project themselves as a critical technology to achieve large-scale utilization of solar-energy sources. 5-7Despite the strong research interest on solar-hydrogen materials and technologies, there have only been a limited number of demonstrations of solar water splitting devices. Most of these devices show short lifetimes (<1 day), low efficiencies, or use materials and designs that would prevent their practical and economical implementation. 6,8 Deployable solar-hydrogen devices would need to function stably for years, produce robustly and continuously nearly pure H 2 streams, incorporate ...

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2D Materials for Solar Cell Applications

Acharya

Sahoo³

et al. 2021

Materials for Solar Energy Conversion

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Back-Contacted Silicon Heterojunction Solar Cells With Efficiency >21%

Cited by 72 publications

References 48 publications

Back-Contacted Silicon Heterojunction Solar Cells: Optical-Loss Analysis and Mitigation

Back-Contacted Silicon Heterojunction Solar Cells: Optical-Loss Analysis and Mitigation

Solar-to-Hydrogen Production at 14.2% Efficiency with Silicon Photovoltaics and Earth-Abundant Electrocatalysts

2D Materials for Solar Cell Applications

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