Recombination rates in heterojunction silicon solar cells analyzed by impedance spectroscopy at forward bias and under illumination

Mora‐Seró, Iván; Luo, Yan; García-Belmonte, Germà; Bisquert, Juan; Muñoz, D.; Voz, C.; Puigdollers, J.; Alcubilla, R.

doi:10.1016/j.solmat.2007.11.005

Cited by 74 publications

(72 citation statements)

References 15 publications

(12 reference statements)

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“…This points to the fact that band offsets may play a role too in operation of a-Si:H films as semi-permeable carrier membranes, and thus the operation of SHJ devices. More quantitatively, simulation programs such as AFORS-HET developed by HZB in Germany [169], or others [170], or device-circuit modeling [171] may further aid in understanding SHJ device operation.…”

Section: Basic Considerationsmentioning

confidence: 99%

High-efficiency Silicon Heterojunction Solar Cells: A Review

Wolf¹,

Descoeudres²,

Holman³

et al. 2012

Green

108

113

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Abstract. Silicon heterojunction solar cells consist of thin amorphous silicon layers deposited on crystalline silicon wafers. This design enables energy conversion efficiencies above 20% at the industrial production level. The key feature of this technology is that the metal contacts, which are highly recombination active in traditional, diffused-junction cells, are electronically separated from the absorber by insertion of a wider bandgap layer. This enables the record open-circuit voltages typically associated with heterojunction devices without the need for expensive patterning techniques. This article reviews the salient points of this technology. First, we briefly elucidate device characteristics. This is followed by a discussion of each processing step, device operation, and device stability and industrial upscaling, including the fabrication of solar cells with energyconversion efficiencies over 21%. Finally, future trends are pointed out.

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Section: Basic Considerationsmentioning

confidence: 99%

High-efficiency Silicon Heterojunction Solar Cells: A Review

Wolf¹,

Descoeudres²,

Holman³

et al. 2012

Green

108

113

View full text Add to dashboard Cite

show abstract

“…This approach has been amply used in recent years for dyesensitized solar cells (DSC) [2][3][4][5][6][7][8] and organic solar cells, 9,10 while there are only a few works to date on solid state devices, such as those based on nanocrystalline/amorphous Si, [11][12][13] thin-film CdTe/CdS, 14 GaAs/Ge 15,16 and CdS/Cu(In,Ga)Se 2 solar cells.…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy characterisation of highly efficient silicon solar cells under different light illumination intensities

Mora‐Seró

García-Belmonte

Boix

et al. 2009

Energy Environ. Sci.

Self Cite

252

196

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Highly efficient silicon solar cells have been characterised by impedance spectroscopy and currentpotential characteristic in the dark and with different illumination intensities. For each illumination the impedance behaviour has been analysed at different applied bias potentials, in the forward and reverse region, comparing the results with the current-potential characteristic. Different cell parameters, as series and parallel resistances, capacitance, diode factor, minority carrier lifetime, acceptor impurities density and depletion layer charge density have been obtained as a function of bias voltage for different light illumination intensities. The effect of light-generated carriers and applied bias in the behaviour of the solar cell under illumination is discussed.

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“…1 The power of impedance analysis in this case lies in its ability to separate contributions from different layers or regions of a solar cell structure. 2 The method was shown to provide detailed assessment of the device properties, as well as of the possible impact on the overall performance, from each of the device regions individually.…”

Section: Introductionmentioning

confidence: 99%

“…2 Here a series of thin-film devices based on the CdTe/CdS p-n junction and grown by metal organic chemical vapor deposition 8,9 ͑MOCVD͒ is being investigated. The study is focused on the critical aspects of device structure, such as ͑i͒ the effect from incorporation of a thin barrier layer on device electrical properties and performance; ͑ii͒ the change in properties induced by a variation of the doping level in the p-type CdTe absorber; ͑iii͒ the comparison of impedance characteristics between the samples with and without an extra highly doped CdTe:As layer next to the metal back contact.…”

Section: Introductionmentioning

confidence: 99%

Impedance spectroscopy of thin-film CdTe/CdS solar cells under varied illumination

Proskuryakov

Durose

Turkestani

et al. 2009

Journal of Applied Physics

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The electrical properties of CdTe/CdS solar cells grown by metal organic chemical vapor deposition were investigated by a technique of impedance measurements under varied intensity of AM1.5 illumination. A generalized impedance model was developed and applied to a series of CdTe/CdS cells with variations in structure and doping. The light measurements were compared to the conventional ac measurements in dark under varied dc bias, using the same methodology for equivalent circuit analysis in both cases. Detailed information on the properties of the device structure was obtained, including the properties of the main p-n junction under light, minority carrier lifetime, back contact, as well as the effect of the blocking ZnO layer incorporated between the transparent conductor and CdS layers. In particular, the comparison between samples with different chemical concentrations of As has shown that the total device impedance and the series resistance are strongly increased at lower As densities, resulting in the lower collection current and efficiencies. At the same time the minority carrier lifetime was found to be one order of magnitude larger for the lowest value of As density, when compared to the optimized devices.

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Recombination rates in heterojunction silicon solar cells analyzed by impedance spectroscopy at forward bias and under illumination

Cited by 74 publications

References 15 publications

High-efficiency Silicon Heterojunction Solar Cells: A Review

High-efficiency Silicon Heterojunction Solar Cells: A Review

Impedance spectroscopy characterisation of highly efficient silicon solar cells under different light illumination intensities

Impedance spectroscopy of thin-film CdTe/CdS solar cells under varied illumination

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