High efficiency cell development. Final technical progress report, 1978. Texas Instruments report No. 03-79-16. [Tandem Junction Cell with back contacts]

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This activity focused on the development of a novel cell structure, the Tandem Junction Cell (TJC), developed at Texas Instruments. The TJC features an all back contact cell having a textured front surface that contains an electrically floating N/sup +//P junction. The illuminated side (front) of the TJC is textured to reduce reflection and to increase the path length of the absorbed light. A shallow N/sup +/ junction is diffused into the front surface. The thin base region, approx. 100 ..mu..m, is P type. The N/sup +/ collecting junction and P/sup +/ contact regions are formed on the back side. ... continued below

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Pages: 46

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Carbajal, Bernard G. February 1, 1979.

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Description

This activity focused on the development of a novel cell structure, the Tandem Junction Cell (TJC), developed at Texas Instruments. The TJC features an all back contact cell having a textured front surface that contains an electrically floating N/sup +//P junction. The illuminated side (front) of the TJC is textured to reduce reflection and to increase the path length of the absorbed light. A shallow N/sup +/ junction is diffused into the front surface. The thin base region, approx. 100 ..mu..m, is P type. The N/sup +/ collecting junction and P/sup +/ contact regions are formed on the back side. The N/sup +/ and P/sup +/ regions are in the form of an interposed finger pattern. This solar cell structure has several very attractive built-in features. With no contact metallization on the front side, shadowing is eliminated. The back contact system is particularly useful in module assembly. All interconnects and bus bars can be located behind the solar cells and virtually no module space is wasted. The TJC appears to offer the opportunity to achieve very high efficiency for silicon solar cells. Development work under this activity was primarily focused on improvements in the contact metallization pattern, shallow front N/sup +/ diffusion and methods to improve V/sub oc/. Included in this effort, is the effect of minority carrier lifetime and cell thickness. At the beginning of this program, 2 x 2 cm TJC's with AM1 efficiency in the 10 to 12% range had been fabricated.

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Pages: 46

Notes

Dep. NTIS, PC A03/MF A01.

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  • Report No.: DOE/JPL/954881-5
  • Grant Number: NAS-7-100-954881
  • DOI: 10.2172/5868308 | External Link
  • Office of Scientific & Technical Information Report Number: 5868308
  • Archival Resource Key: ark:/67531/metadc1096024

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • February 1, 1979

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • April 2, 2018, 1:13 p.m.

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Carbajal, Bernard G. High efficiency cell development. Final technical progress report, 1978. Texas Instruments report No. 03-79-16. [Tandem Junction Cell with back contacts], report, February 1, 1979; United States. (digital.library.unt.edu/ark:/67531/metadc1096024/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.