Fabrication and characterisation of Si micropillar PV structures. (November 2014)

• Record Type: Journal Article
• Authors: Oates, A.; Cabrera-España, F. J.; Agrawal, A.; Reehal, H. S.
• Is Part Of: Materials research innovations. Volume 18:Number 7(2014)
• Page Start: 500
• Page End: 504
• Publication Date: 2014-11
• Subjects: Silicon, -- Thin film, -- Structured, -- Spin on doping, -- Rapid thermal diffusion; Materials -- Research -- Periodicals; Matériaux -- Recherche -- Périodiques; 620.1105
• DOI: 10.1179/1433075X14Y.0000000244
• Languages: English
• ISSNs: 1432-8917

Abstract

Abstract : Arrays of vertical silicon micropillar radial junction solar cells have been fabricated by diffusion of direct application spin on dopant and from the vapour phase through proximity rapid thermal diffusion. The micropillars were fabricated by optical lithography and deep reactive ion etching. The micropillar arrays show superior antireflective properties over the measured spectrum and good correlation to finite difference time domain modelling of identical geometry arrays. Junctions formed by a conventional spin on doping process of phosphorus containing dopant solution produced Suns- V oc values in the region of 0·3 V. This value is likely due to difficulties encountered in achieving an even distribution of dopant over the entire surface of the arrays. An alternative method utilising spin on dopant but employing an intermediate vapour phase diffusion step produced promising results with Suns- V oc values reaching 0·5 V following a post-diffusion drive-in step.