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in subjects: "Back Contacts"

open access

ZnTe:Cu Contact Optimization Strategies for Single-Junction and Multijunction CdS/CdTe PV Device Designs

The ability to produce high-performance CdS/CdTe photovoltaic (PV) devices that incorporate high-transparency back contacts for multijunction thin-film PV applications will require an even greater level of understanding than has been required for single-junction devices. This study reports some of our initial investigations at NREL to modify the ZnTe:Cu contact process previously developed for single-junction applications for optimal use as a transparent back contact. We have succeeded in produ… more

Date: May 1, 2003

Creator: Gessert, T.; Coutts, T.; Dhere, R.; Duda, A. & Levi, D.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Thin Films and the Systems-Driven Approach

A systems-driven approach is used to discern tradeoffs between cost and efficiency improvements for various thin-film module technologies and designs. Prospects for reduced system cost via such strategies are enhanced as balance-of-systems costs decline, and some strategies are identified for greater research focus.

Date: January 1, 2005

Creator: Zweibel, K.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Overcoming Degradation Mechanisms in CdTe Solar Cells; Second Annual Report, August 1999-August 2000

The scientific literature concerning degradation and atomic diffusion in CdTe/CdS cells has been reviewed. This led to the conclusion that there appear to be unexplained differences between module and cell stability, possibly due to the difference between encapsulated and air-exposed systems. A comprehensive model for Cu-assisted cell degradation is suggested, which should now be tested experimentally by the appropriate R and D teams. Both LBIC and EBIC have been used to distinguish between str… more

Date: February 1, 2001

Creator: Cahen, D.; Hodes, G. & Gartsman, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Well-Passivated a-Si:H Back Contacts for Double-Heterojunction Silicon Solar Cells: Preprint

We have developed hydrogenated amorphous silicon (a Si:H) back contacts to both p- and n-type silicon wafers, and employed them in double-heterojunction solar cells. These contacts are deposited entirely at low temperature (<250 C) and replace the standard diffused or alloyed back-surface-field contacts used in single-heterojunction (front-emitter only) cells. High-quality back contacts require excellent surface passivation, indicated by a low surface recombination velocity of minority-carri… more

Date: May 1, 2006

Creator: Page, M. R.; Iwaniczko, E.; Xu, Y.; Wang, Q.; Yan, Y.; Roybal, L. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

XPS and AES Studies of Cu/CdTe(111)-B

Copper is frequently used as a p-type dopant to improve the performance of back contacts in CdTe thin-film solar cells. In this study, surface-analysis techniques are used to probe fundamental interactions between Cu and the CdTe(111)-B surface. The results presented here were facilitated by the newly constructed surface-analysis cluster tool in the Measurements and Characterization Division at NREL; they reveal a host of fundamental phenomena that occur in the Cu/CdTe system.

Date: January 1, 2005

Creator: Teeter, G.; Gessert, T. A. & Asher, S. E.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Advanced Processing of CdTe- and CuIn{sub x}Ga{sub 1{minus}x}Se{sub 2}-Based Solar Cells; Phase I Report

The main tasks of the cadmium telluride portion of this project include the development of simplified processing for fabricating high-efficiency CdTe solar cells, studies on the long-term stability of CdTe devices, and the development of alternative transparent conducting oxides, window layers, and back contacts. The second portion of this project focused on CIGS solar cells. The main tasks include the development of a manufacturable process for CIGS devices and the development of high-band-gap… more

Date: September 5, 2000

Creator: Morel, D. L. & Ferekides, C. S.

Item Type: Report

Partner: UNT Libraries Government Documents Department