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Syracuse University

Disordered solids

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Full-Text Articles in Physics

Hole Drift Mobility Measurements On A-Si:H Using Surface And Uniformly Absorbed Illumination, Steluta A. Dinca, Eric A. Schiff, S. Guha, Baojie Yan, Jeff Yang Jan 2009

Hole Drift Mobility Measurements On A-Si:H Using Surface And Uniformly Absorbed Illumination, Steluta A. Dinca, Eric A. Schiff, S. Guha, Baojie Yan, Jeff Yang

Physics

The standard, time-of-flight method for measuring drift mobilities in semiconductors uses strongly absorbed illumination to create a sheet of photocarriers near an electrode interface. This method is problematic for solar cells deposited onto opaque substrates, and in particular cannot be used for hole photocarriers in hydrogenated amorphous silicon (a-Si:H) solar cells using stainless steel substrates. In this paper we report on the extension of the time-of-flight method that uses weakly absorbed illumination. We measured hole drift-mobilities on seven a-Si:H nip solar cells using strongly and weakly absorbed illumination incident through the n-layer. For thinner devices from two laboratories ...


Temperature Dependence Of The Electron Diffusion Coefficient In Electrolyte-Filled Tio2, Nikos Kopidakis, Kurt D. Benkstein, Arthur J. Frank, Quan Yuan, Eric A. Schiff Jan 2006

Temperature Dependence Of The Electron Diffusion Coefficient In Electrolyte-Filled Tio2, Nikos Kopidakis, Kurt D. Benkstein, Arthur J. Frank, Quan Yuan, Eric A. Schiff

Physics

The temperature and photoexcitation density dependences of the electron transport dynamics in electrolytefilled mesoporous TiO2 nanoparticle films were investigated by transient photocurrent measurements. The thermal activation energy of the diffusion coefficient of photogenerated electrons ranged from 0.19–0.27 eV, depending on the specific sample studied. The diffusion coefficient also depends strongly on the photoexcitation density; however, the activation energy has little, if any, dependence on the photoexcitation density. The light intensity dependence can be used to infer temperature-independent dispersion parameters in the range 0.3–0.5. These results are inconsistent with the widely used transport model that ...


Temperature Dependence Of The Electron Diffusion Coefficient In Electrolyte-Filled Tio2 Nanoparticle Films: Evidence Against Multiple Trapping In Exponential Conduction-Band Tails, Nikos Kopidakis, Kurt D. Benkstein, Jao Van De Lagemaat, Quan Yuan, Eric A. Schiff Jan 2006

Temperature Dependence Of The Electron Diffusion Coefficient In Electrolyte-Filled Tio2 Nanoparticle Films: Evidence Against Multiple Trapping In Exponential Conduction-Band Tails, Nikos Kopidakis, Kurt D. Benkstein, Jao Van De Lagemaat, Quan Yuan, Eric A. Schiff

Physics

The temperature and photoexcitation density dependences of the electron transport dynamics in electrolytefilled mesoporous TiO2 nanoparticle films were investigated by transient photocurrent measurements. The thermal activation energy of the diffusion coefficient of photogenerated electrons ranged from 0.19–0.27 eV, depending on the specific sample studied. The diffusion coefficient also depends strongly on the photoexcitation density; however, the activation energy has little, if any, dependence on the photoexcitation density. The light intensity dependence can be used to infer temperature-independent dispersion parameters in the range 0.3–0.5. These results are inconsistent with the widely used transport model that ...