The Effects of Solar Cell Capacitance on Calibration Accuracy When using a Flash Simulator

Monokroussos, Christos; Gottschalg, Ralph; Tiwari, Ayodhya N.; Friesen, Gabi; Chianese, D.; Mau, Susanne

doi:10.1109/wcpec.2006.279953

Cited by 26 publications

(24 citation statements)

References 5 publications

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“…Typically, capacitance is dominated by junction capacitances at low voltages (~0-0.3V) increasing linearly, then diffusion capacitance (~0.3-0.7V) takes over so that, the total capacitance increases exponentially. Finally for voltages above 0.7V total capacitance shows a rapid decrease attributed to the interface states [15].…”

Section: Fundamentalsmentioning

confidence: 92%

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Zaraket¹,

Aillerie²,

Salame³

2015

Energy Procedia

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The main purpose of this work was to study the effect of electric currents reverse stress on the capacitance and in general the performance of photovoltaic modules. Different levels of reverse stress current are injected into the solar cell structure and the C-V characteristic are measured in the dark and illuminated conditions, at room temperature for several common periods of time. A digital double exponential model was used to analyze the experimental measurements. The dramatic changes in capacitance characteristics are caused from the effect of a reverse current introduced for different stress levels, simulated the effect of accumulated extreme reverse currents that can occur in the solar cells and modules for different reasons. The paper contributes to research on the adverse effects of reverse currents on the capacitance and normal functioning of cells and solar modules.

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Section: Fundamentalsmentioning

confidence: 92%

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Zaraket¹,

Aillerie²,

Salame³

2015

Energy Procedia

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“…53 The hysteresis effect is a common phenomenon observed in thin film solar cells, such as CdTe, GIGS and amorphous silicon. 56,57 In fact, none of the reported models could be universally verified to elaborate the hysteresis effect in all types of solar cells. Several dynamic models based on diode and capacitances have been built to understand the inside mechanism.…”

Section: The Hysteresis Effectmentioning

confidence: 99%

Efficient and low-temperature processed perovskite solar cells based on a cross-linkable hybrid interlayer

Liu

et al. 2015

J. Mater. Chem. A

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A cross-linkable conjugated polymer, poly [9,9-bis(6′-(N,N-diethylamino)propyl)-fluorenealt-9,9-bis-(3-ethyl(oxetane-3-ethyloxy)-hexyl)-fluorene (PFN-OX), was investigated as the ntype interface layer for highly efficient and low-temperature processed planar heterojunction perovskite solar cells. Hybrid composite films consisting of PFN-OX and ZnO nanoparticles were utilized as the electron selective layers, and a remarkable power conversion efficiency over 16% was achieved. The cross-linkable PFN-OX provided a robust hybrid composite electron selective layer, which is solvent-resistant during the device fabrication process and results in efficient electron extraction and hole-blocking. Meanwhile, the time-resolved photoluminescence quenching measurements indicated that the charge separation and collection processes were improved for the devices based on PFN-OX:ZnO, in comparison with the devices using pure PFN-OX or ZnO. Device stability and the hysteresis effect were also discussed. Moreover, this study introduces the cross-linking concept in the perovskite solar cells, which will potentially be an effective strategy for high performance perovskite solar cells.4 coefficient, small exciton binding energy, high mobilities of carriers and long exciton diffusion length. 6,21,22,23 These advances have ensured the superior photovoltaic performance for the hybrid perovskites solar cells.In addition to the mesoporous PSSCs, the planar heterojuncton PSSCs 24 have also been developed, which have the advantage of low-temperature process and is suitable for the flexible substrates. 25,26 The planar heterojunction PSSC devices possess the layered architecture, which consists of multiple functional films sandwiched between anode and cathode. These functional films include the electron selective contacts (ESCs), perovskite absorber layer, and hole selective contacts (HSCs). 27 In order to achieve high device performance, various approaches have been conducted. For example, morphology control of the perovskite film 28,29 and the optimization of hole-conducting materials 30,31 have been extensively studied to optimize the device performance. Moreover, intensive efforts have also been made for interface engineering at the electron selective contacts. This provides an effective strategy to enhance the electron collection, leading to the improved device performance. The most commonly used ESC for planar heterojunction PSSCs is based on the titanium oxide (TiOx) materials. 32,33 Several other attempts, include the TiO2/graphene nanocomposites, 34 ZnO nanoparticles 35 and the ultrathin graphene quantum dots 36 were reported as the low-temperature processed ESCs and considerable device efficiencies of over 15% were achieved. Moreover, the surface modification strategy has also been demonstrated to achieve the n-type contact between the active layer and the electrode. 37,38,39 By modifying the surface energy of ITO substrate with Cs2CO3, a device efficiency exceeding 15% was achieved. 37 Most recently, a hybrid n-type contact consisti...

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“…For example, a steady state simulator can deliver highly accurate measurements for solar devices with a long time constant, but introduces thermal control issues and has high operation and maintenance costs, largely due to the short life-time of the light sources and the frequent down-times needed to replace them. Flash simulators, on the other hand, influence device temperature to a lesser extent and the operating costs are lower, but care must be taken to avoid measurement artefacts such as capacitive effects [1], which can distort I-V curves and lead to inaccurate power rating. Both types have, in their simple, one-lamp type form, the disadvantage of significant distortion of the spectrum due to the illumination source.…”

Section: Introductionmentioning

confidence: 99%

An LED-based photovoltaic measurement system with variable spectrum and flash speed

Bliss

Betts

Gottschalg

2009

Solar Energy Materials and Solar Cells

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Outdoor environmental variability ingenerates the need for indoor systems for PV module characterisation. To combine the advantages of the most commonly used simulators (steady-state and pulsed) and eliminate their disadvantages, an LED-based solar simulator prototype has been developed.The system can produce light at variable flash speeds and pulse shapes or can operate as a continuous light source for long-term measurements. The system achieves one sun intensity at a closely matched, continuous spectrum. Full control of all light sources allows variable intensity and spectral distribution during measurements. A technical description and results of initial qualification tests are given.

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The Effects of Solar Cell Capacitance on Calibration Accuracy When using a Flash Simulator

Cited by 26 publications

References 5 publications

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Capacitance Evolution of Photovoltaic Solar Modules Under the Influence of Electrical Stress

Efficient and low-temperature processed perovskite solar cells based on a cross-linkable hybrid interlayer

An LED-based photovoltaic measurement system with variable spectrum and flash speed

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