Download e-book for kindle: Advances in thin-film solar cells by I M Dharmadasa

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By I M Dharmadasa

ISBN-10: 9814316075

ISBN-13: 9789814316071

This booklet concentrates at the most recent advancements in our realizing of solid-state machine physics. the cloth provided is principally experimental and in response to CdTe thin-film sun cells. It extends those new findings to CIGS thin-film sun cells and provides a brand new gadget layout according to graded bandgap multilayer sunlight cells. This layout has been experimentally confirmed utilizing the well-researched GaAs/AlGaAs approach and preliminary units have proven striking gadget parameters. those units are able to soaking up all radiation (UV, noticeable, and infra-red) in the sun spectrum and combines "impact ionization" and "impurity photovoltaic" results. the enhanced machine realizing provided during this booklet may still effect and consultant destiny equipment layout and reasonably cheap thin-film sunlight panel manufacture.

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It is also evident that the Voc depends on the value of n, the ideality factor of the diode. 00). 00, indicating a helpful parameter to 19 July 27, 2012 17:5 PSP Book - 9in x 6in 20 Photovoltaic Solar Energy Conversion improve Voc . But in real devices, J sc is drastically reduced and, hence, Voc decreases. There is another factor which affects the value of n of a Schottky diode. In the case of metal-insulator–semiconductor (MIS)-type interfaces, the n value and φb increase as the insulating layer is incorporated and this effect helps in increasing the Voc of a solar cell device [15].

Open circuit voltage (Voc ): This is the voltage measured when the external circuit is in open condition, or when there is no current flow in the external circuit. 14 I-V characteristics of a PV solar cell under dark and illuminated conditions. • Short circuit current density ( J sc ): This is the current density produced when the two contacts are short circuited, or when there is zero voltage across the two contacts. This parameter is expressed as mAcm−2 for convenience and provides easy comparison between devices fabricated with varying contact areas.

The best candidate to satisfy all these conditions is the graded bandgap multi-layer solar cell structure, as shown in Fig. 16, based on n-type and p-type window materials. Chapters 6, 7, and 8 are devoted to the discussion of these devices together with the latest experimental results to indicate their high potential. It may be useful at this stage to note that the graded bandgap structures are based on a large number of p-p- or n-n-type heterojunctions and two ohmic contacts to the front and the back of the device.

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Advances in thin-film solar cells by I M Dharmadasa

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