Temperature effects in Schottky-barrier silicon solar cells

Vernon, S. M.; Anderson, Wayne A.

doi:10.1063/1.88044

Cited by 44 publications

(20 citation statements)

References 8 publications

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“…In the normal states above T c , the open circuit voltage V oc decreases with temperature (top of Fig. 3b), similar to the linear behavior of V oc for normal solar cells based on p-n junctions313233. Although the change rate of V oc with temperature (− dV oc /dT ), which depends strongly on laser intensity, is much smaller than that of normal solar cells, the temperature coefficient of V oc for YBCO-Ag junction has the same order of magnitude as that of the solar cells.…”

Section: Discussionsupporting

confidence: 71%

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Yang

Han

Chang

2015

Sci Rep

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We report remarkable photovoltaic effect in YBa2Cu3O6.96 (YBCO) ceramic between 50 and 300 K induced by blue-laser illumination, which is directly related to the superconductivity of YBCO and the YBCO-metallic electrode interface. There is a polarity reversal for the open circuit voltage Voc and short circuit current Isc when YBCO undergoes a transition from superconducting to resistive state. We show that there exists an electrical potential across the superconductor-normal metal interface, which provides the separation force for the photo-induced electron-hole pairs. This interface potential directs from YBCO to the metal electrode when YBCO is superconducting and switches to the opposite direction when YBCO becomes nonsuperconducting. The origin of the potential may be readily associated with the proximity effect at metal-superconductor interface when YBCO is superconducting and its value is estimated to be ~10–8 mV at 50 K with a laser intensity of 502 mW/cm2. Combination of a p-type material YBCO at normal state with an n-type material Ag-paste forms a quasi-pn junction which is responsible for the photovoltaic behavior of YBCO ceramics at high temperatures. Our findings may pave the way to new applications of photon-electronic devices and shed further light on the proximity effect at the superconductor-metal interface.

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Section: Discussionsupporting

confidence: 71%

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Yang

Han

Chang

2015

Sci Rep

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“…Three enhancement mechanisms have been proposed 61,62 : more efficient light trapping in the semiconductor, optical nearfield enhancement, and hot-carrier injection from the plasmonic nanoparticles to the junction. Interestingly, the short-circuit current I SC of pn and Schottky junctions increases with increasing temperature 63,64 . Thus, an increase in the measured current in a solar cell could a priori originate from a photothermal effect.…”

Section: Procedures # 3: Infrared and Thermocouple Measurementsmentioning

confidence: 99%

Simple experimental procedures to distinguish photothermal from hot-carrier processes in plasmonics

et al. 2020

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Light absorption and scattering of plasmonic metal nanoparticles can lead to non-equilibrium charge carriers, intense electromagnetic near-fields, and heat generation, with promising applications in a vast range of fields, from chemical and physical sensing to nanomedicine and photocatalysis for the sustainable production of fuels and chemicals. Disentangling the relative contribution of thermal and non-thermal contributions in plasmon-driven processes is, however, difficult. Nanoscale temperature measurements are technically challenging, and macroscale experiments are often characterized by collective heating effects, which tend to make the actual temperature increase unpredictable. This work is intended to help the reader experimentally detect and quantify photothermal effects in plasmon-driven chemical reactions, to discriminate their contribution from that due to photochemical processes and to cast a critical eye on the current literature. To this aim, we review, and in some cases propose, seven simple experimental procedures that do not require the use of complex or expensive thermal microscopy techniques. These proposed procedures are adaptable to a wide range of experiments and fields of research where photothermal effects need to be assessed, such as plasmonic-assisted chemistry, heterogeneous catalysis, photovoltaics, biosensing, and enhanced molecular spectroscopy.

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“…1 Presently, an overwhelming majority of the research is focused on PEC cells operating at room temperature, largely due to the decreasing photovoltage 2,3 and limited electrolyte stability with increasing temperatures. 2,3 Despite these drawbacks, however, thermal energy improves many aspects of photoelectrochemistry, such as carrier transport and electrocatalysis. 2,3 Despite these drawbacks, however, thermal energy improves many aspects of photoelectrochemistry, such as carrier transport and electrocatalysis.…”

Section: Introductionmentioning

confidence: 99%

“…For particulate photocatalyts such as TiO 2 , there have been a few experimental demonstrations of appreciable solar-tohydrogen efficiency improvement with temperature. [21][22][23] Several device-level implementations using concentrated sunlight were proposed.…”

Section: Introductionmentioning

confidence: 99%

Thermally-enhanced minority carrier collection in hematite during photoelectrochemical water and sulfite oxidation

Yang

Boloor

et al. 2015

J. Mater. Chem. A

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Many metal-oxide light absorbing semiconductors, such as a-Fe 2 O 3 (hematite), exhibit localized small polaron carrier conduction. The low electron/hole mobility hinders minority carrier transport, and is not readily modified through doping or nanostructuring. In this work, we demonstrate that thermal energy, which is available in moderately concentrated sunlight, enhances the minority carrier mobility and photoelectrochemical (PEC) water and sulfite oxidation of 30 nm-thick Ti-doped hematite thin-film photoanodes. In NaOH aqueous electrolyte, the instantaneous Tafel slope at 3 mA cm À2 decreases remarkably from 480 mV dec À1 (at 7 C) to 240 mV dec À1 (at 72 C) under 9 suns illumination, representing a substantial increase in the fill factor, which also depends on the doping level. Though the photovoltage decreases with temperature expectedly, we show that it can be mitigated by increasing the light intensity. In the presence of a Na 2 SO 3 hole scavenger, the photocurrent at 1.23 V vs. reversible hydrogen electrode increased from 3.1 (at 7 C) to 5.0 mA cm À2 (at 72 C) under 8 suns illumination, and the onset potential was shown to depend weakly on the temperature. The strong increase in the photocurrent with temperature in the limit of fast reaction kinetics suggests that it arises from an improvement in the collection of minority carriers in the diffusion region of hematite. We show that room temperature and 1 sun illumination intensity is not the optimal reaction operating condition for hematite photoanodes. The thermally-enhanced minority carrier transport are likely generalizable to other small-polaron-type light absorbers for PEC and solar cells.

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Temperature effects in Schottky-barrier silicon solar cells

Cited by 44 publications

References 8 publications

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Origin of photovoltaic effect in superconducting YBa2Cu3O6.96 ceramics

Simple experimental procedures to distinguish photothermal from hot-carrier processes in plasmonics

Thermally-enhanced minority carrier collection in hematite during photoelectrochemical water and sulfite oxidation

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