On the cause of the flat-spot phenomenon observed in silicon solar cells at low temperatures and low intensities | Zendy

Victor G. Weizer | Zendy; J. D. Broder | Zendy

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On the cause of the flat-spot phenomenon observed in silicon solar cells at low temperatures and low intensities

Author(s) -

Victor G. Weizer,

J. D. Broder

Publication year - 1982

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.331435

Subject(s) - silicon , materials science , diffusion , substrate (aquarium) , vacancy defect , diffusion barrier , tin , condensed matter physics , optoelectronics , metallurgy , composite material , chemistry , crystallography , thermodynamics , oceanography , physics , layer (electronics) , geology

A model that explains the flat-spot power loss phenomenon is presented. Evidence suggests that the effect is due to localized metallurgical interactions between the silicon substrate and the contact metallization. These reactions are shown to result in localized regions in which the P-N junction is destroyed and replaced with a metal semiconductor-like interface. The effects of thermal treatment, crystallographic orientation, junction depth, and metallization are shown along with a method of preventing the effect through the suppression of vacancy formation at the free surface of the contact metallization. Data indicating the effectiveness of a TiN diffusion barrier in preventing the effect are also given.

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