Published August 20, 2019 | Version v1
Preprint Open

Decoupling of Optical and Electrical Properties of Rear Contact CIGS Solar Cells

Creators

  • 1. International Iberian Nanotechnology Laboratory
  • 2. Uppsala University

Description

A novel architecture that comprises rear interface passivation and increased rear optical reflection is presented with the following advantages: i) an enhanced optical reflection is achieved by depositing a metallic layer over the Mo rear contact; ii) the addition of a sputtered Al2O3 layer improves the interface quality with CIGS; and, iii) the rear-openings are refilled with Mo to maintain the optimal ohmic electrical contact as generally observed from the growth of CIGS on Mo. Hence, a decoupling between the electrical function and the optical function of the substrate is achieved. We present in detail the manufacturing procedure of such type of architectures together with its benefits and caveats. A preliminary electrical analysis of resulting solar cells showing a proof-of-concept of the architecture is presented and discussed.

Notes

This work was funded in part by the Fundação para a Ciência e a Tecnologia (FCT) under Grants IF/00133/2015 and PD/BD/142780/2018, in part by the European Union's Horizon 2020 Research and Innovation Programme ARCIGS-M project under Grant 720887, in part by NovaCell (028075), in part by InovSolarCells (029696) cofunded by FCT and the ERDF through COMPETE2020, and in part by Fundação Luso-Americana para o Desenvolvimento (FLAD) under Project 2019/CON8/CAN19.

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2019-07-14_Ta_lift_off.pdf

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Additional details

Funding

European Commission
ARCIGS-M - Advanced aRchitectures for ultra-thin high-efficiency CIGS solar cells with high Manufacturability 720887