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Properties of screen-printed modified graphite layers

Walter J., Mierzwiński W.

Archives of Foundry Engineering

2010

Vol. 10, iss. 3 spec.

153--156

During last years protection of the environment is one of the important problems that should be solved by modern technology. The important problems are toxic gases emitted by conventional power plants. One of the methods that contribute to decreasing air pollution is manufacturing of cheap solar energy devices that could be applied in households. Among different type of fabrication technology of solar cells, DSSC technology looks like one of the interesting because it is relatively simple and low cost technology. Nowadays a lot of researcher groups making investigations to improve its setup, to get the cost reduction. The methods to achieve this goal were proposed in ISE (Germany) as a concept of monolithic dye sensitised solar cell. One of the ideas of this solar cells setup is replacing expensive TCO electrode by much cheaper graphite electrode. Replacing TCO glass by graphite layer has to be done only in case of comparable properties of those both electrodes. There are some tested ideas of manufacturing that electrode and some of them are successfully applied. Presented work has been focused on preparation graphite conductive electrode for DSSC technology application, fabricated by screen–printing technique. Investigations concern new graphite past composition suitable for graphite layer preparation. It was been found that applying additive of titanium organic compound (Tyzor GBA) to the past composition result in good properties, characterised by low resistance and good adhesion between graphite particles in the printed layer. Some tested layers prepared from proposed paste compositions characterised by better conductivity then applied in conventional DSSC cells counter electrode. The optimal addition of the modifier has not fixed yet. Among tested pastes the most promising results has been achieved for paste contained the biggest amount of Tyzor GBA.

Grafitowe warstwy przewodzące wytwarzane techniką sitodruku

Walter J., Skupień K., Putyra P.

Archiwum Odlewnictwa

2006

R. 6, nr 21/2

169-176

W artykule zamieszczono wyniki badań przewodnictwa warstw grafitowych nanoszonych metodą sitodruku przeznaczonych do zastosowania w ogniwach fotowoltaicznych. Warstwy te wytwarzane są za pomocą past zawierających substancje organiczne, które mogę być z niej usunięte w temperaturze do 350°C co zapewnia dobre przewodnictwo elektryczne. Warstwa taka jest zwarta zapewniając odpowiednie połączenia elektryczne pomiędzy cząstkami grafitu.

The article presents the results of the studies on conductive behaviour of graphite layers applied by the technique of screen process and assigned for operation in photovoltaic cells. The layers are produced using pastes containing some organic matters, which can be removed at a temperature of up to 350°C , thus ensuring a good electric conduction. A layer made by this technique is very compact which makes the graphite particles come closely into contact with each other.