Low-light divergence in photovoltaic parameter fluctuations

Shvydka, Diana; Karpov, V. G.; Compaan, A. D.
March 2003
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2157
Academic Journal
We study statistics of the major photovoltaic (PV) parameters, such as open-circuit voltage, short-circuit current, etc., versus light intensity on a set of nominally identical thin-film CdTe/CdS solar cells. A crossover light intensity is found, below which the relative fluctuations of the PV parameters diverge inversely proportional to the square root of the light intensity. We propose a model in which the observed fluctuations are due to lateral nonuniformities in the device structure. The crossover is attributed to the lateral nonuniformity screening length exceeding the device size. From the practical standpoint, our study introduces a simple uniformity diagnostic technique.


Related Articles

  • Organic solar cell based on multistep charge separation system. Hiramoto, Masahiro; Fukusumi, Hiroyuki // Applied Physics Letters;11/23/1992, Vol. 61 Issue 21, p2580 

    Investigates the photovoltaic properties of p-n heterojunction organic solar cell based on multistep charge separation system. Effect of the formation of downward potential step in p-n heterojunction on photocurrent quantum efficiency; Use of metal-free phthalocyanine as p-type layer; Chemical...

  • Efficient photovoltaic cells from semiconducting polymer heterojunctions. Jenekhe, Samson A.; Yi, Shujian; Shujian Yi // Applied Physics Letters;10/23/2000, Vol. 77 Issue 17 

    Solar cells made from spin-coated bilayer thin-film heterojunctions of poly(p-phenylene vinylene) and poly(benzimidazobenzophenanthroline ladder) were found to have photovoltaic charge collection efficiency as high as 49%. The power conversion efficiency varied from 1.4% under sunlight...

  • Diffusion length in CdTe by measurement of photovoltage spectra in CdS/CdTe solar cells. Tousek, J.; Kindl, D.; Touskov√°, J.; Dolhov, S.; Poruba, A. // Journal of Applied Physics;1/1/2001, Vol. 89 Issue 1, p460 

    Modified method of surface photovoltage (SPV), spectral response measurement, and constant photocurrent method (CPM) were applied to thin film CdS/CdTe solar cells with the aim of finding diffusion length of minority carriers (L) in the CdTe material. The SPV signal was theoretically calculated...

  • Quantum efficiencies exceeding unity due to impact ionization in silicon solar cells. Kolodinski, Sabine; Werner, Jurgen H.; Wittchen, Thomas; Queisser, Hans J. // Applied Physics Letters;10/25/1993, Vol. 63 Issue 17, p2405 

    Investigates the internal quantum efficiency of silicon solar cells. Optimization of cell materials and structures for photovoltaic conversion; Mechanism for maximizing solar cell efficiency; Role of impact ionization for the internal quantum efficiency of Si ultraviolet radiation.

  • Efficiency improvements of silicon solar cells by the impurity photovoltaic effect. Keevers, M. J.; Green, M. A. // Journal of Applied Physics;4/15/1994, Vol. 75 Issue 8, p4022 

    Presents information on a study which investigated the impurity photovoltaic effect for improving silicon solar-cell efficiency. Analysis of the theory behind the proposed approach; Methodology of the study; Results and discussion.

  • Impurity photovoltaic effect in c-Si solar cells. A numerical study. Schmeits, M.; Mani, A. A. // Journal of Applied Physics;2/15/1999, Vol. 85 Issue 4, p2207 

    Presents information on a study of the impurity photovoltaic effect in crystalline silicon p-n junction solar cells. Basic equations of numerical analysis; Numerical results; Modified defect concentration profile; Conclusion.

  • Comment on '35&% efficient nonconcentrating novel silicon solar cell'. Luque, Antonio // Applied Physics Letters;8/9/1993, Vol. 63 Issue 6, p848 

    Comments on an article focusing on the quantum efficiency of silicon solar cell. Determination of short circuit current and circuit voltage; Impact of quasi-Fermi level splitting on the current voltage; Occurrence of photovoltaic electric output caused by absorption of thermal radiation.

  • Shunt screening, size effects and I /V analysis in thin-film photovoltaics. Karpov, V. G.; Rich, G.; Subashiev, A. V.; Dorer, G. // Journal of Applied Physics;5/1/2001, Vol. 89 Issue 9, p4975 

    We present an analytical model that quantitatively describes the physics behind shunting in thin film photovoltaics and predicts size-dependent effects in the I/V characteristics of solar cells. The model consists of an array of microdiodes and a shunt in parallel between the two electrodes, one...

  • New ORNL solar cell technology cranks up efficiency.  // Chemical Business;May2011, Vol. 25 Issue 5, p64 

    The article reports on the creation of a three-dimensional (3-D) nanocone-based solar cell platform by a research team led by Jun Xu of Oak Ridge National Laboratory (ORNL) in Tennessee in 2011. The platform is said to be capable of improving the light-to-power conversion efficiency of...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics