Process Development and Basic Studies of Electrochemically Deposited CdTe-Based Solar Cells; Annual Technical Report, Phase I: May 15, 1998 - May 14, 1999

Kaydanov, V.; Ohno, T. R.

doi:10.2172/763460

2000

DOI: 10.2172/763460

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Process Development and Basic Studies of Electrochemically Deposited CdTe-Based Solar Cells; Annual Technical Report, Phase I: May 15, 1998 - May 14, 1999

V. Kaydanov¹,

T. R. Ohno²

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How do Buffer Layers Affect Solar Cell Performance and Solar Cell Stability?

Roedern

2001

MRS Proc.

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Buffer layers are commonly used in the optimization of thin-film solar cells. For CuInSe 2 -and CdTe-based solar cells, multilayer transparent conductors (TCOs, e.g., ZnO or SnO 2 ) are generally used in conjunction with a CdS heterojunction layer. Optimum cell performance is usually found when the TCO layer in contact with the CdS is very resistive or almost insulating. In addition to affecting the open-circuit voltage of a cell, it is commonly reported that buffer layers affect stress-induced degradation and transient phenomena in CdTe-and CuInSe 2 -based solar cells. In amorphous silicon solar cells, light-induced degradation has a recoverable and a nonrecoverable component too, and the details of the mechanism may depend on the p-type contact layer. Because of the similarity of transients and degradation in dissimilar material systems, it is suggested that degradation and recovery are driven by carriers rather than by diffusing atomic species. The question that must be addressed is why, not how, species diffuse and atomic configurations relax differently in the presence of excess carriers. In this paper, I suggest that the operating conditions of a cell can change the carrier transport properties. Often, excess carriers may enhance the conductance in localized regions ("filaments") and buffer layers; limiting current flow into such filaments may therefore control the rate and amount of degradation (or recovery).

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How do Buffer Layers Affect Solar Cell Performance and Solar Cell Stability?

Roedern

2001

MRS Proc.

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Process Development and Basic Studies of Electrochemically Deposited CdTe-Based Solar Cells; Annual Technical Report, Phase I: May 15, 1998 - May 14, 1999

Cited by 1 publication

References 14 publications

How do Buffer Layers Affect Solar Cell Performance and Solar Cell Stability?

How do Buffer Layers Affect Solar Cell Performance and Solar Cell Stability?

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