Abstract

LOURO, P; FERNANDES, M  and  VIEIRA, M. Thin film sensors produced at low temperature: a trade-off between carbon composition and spectral response. Rev. mex. fis. [online]. 2006, vol.52, suppl.2, pp.32-35. ISSN 0035-001X.

A series of large area single layers and homo and heterojunction cells in the assembly glass /ZnO:Al/p (Si_xC_1x: H)/ i (Si: H)/n (Si_xC_1-x :H)Al (0< x< 1) were produced by PECVD at low temperature. Junction properties, carrier transport and photogeneration are investigated from dark and illuminated current-voltage characteristics, and spectral response measurements in dark and under different illumination conditions. For the heterojunction cells atypical J-V characteristics under different illumination conditions are observed leading to poor fill factors. High series resistances around 10⁶Ω were measured. In these structures it was observed that the responsivity decreases with the increase of the light bias intensity. The homoj unction presents the typical behaviour of a non optimized p-i-n cell and the responsivity varies only slightly with the light bias conditions.

Keywords : Heterojunctions; spectral sensitivity; thin films.

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