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Laser processing of TiO2 films for dye solar cells

A thermal, sintering, throughput and embodied energy investigation
 
: Mincuzzi, G.; Schulz-Ruhtenberg, M.; Vesce, L.; Reale, A.; Di Carlo, A.; Gillner, A.; Brown, T.M.

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Progress in Photovoltaics 22 (2014), Nr.3, S.308-317
ISSN: 1062-7995
Englisch
Zeitschriftenaufsatz
Fraunhofer ILT ()

Abstract
We have analysed and optimised a laser process for the sintering of the TiO2 layers in dye solar cells (DSCs). Through a thermographic characterisation of the process, we show that it is possible to scale and process large areas uniformly (16 cm2). We fabricated DSCs with nanocrystalline (nc)-TiO2 films sintered by using pulsed ultraviolet laser with an average output power P varying from 1 W to 7 W whilst mainting a constant power conversion efficiency eta. The highest efficiency reached for a laser sintered DSC was 7%. The time required to sinter 1 m2 of nc-TiO2 film was found to decrease hyperbolically with P, which is important for determining process takt times. We quantified the embodied energy (EE) required to sinter 1 m2 of the active TiO2 layer for a variety of different processes, and found that the EE for the laser sintering process with a system wall plug efficiency of 3.5% to be competitive with the more conventional oven and belt furnace treatments. We outline the main features required from a laser system to carry out an efficient, energetically favourable and industrially applicable automated process with competitive throughput.

: http://publica.fraunhofer.de/dokumente/N-215967.html