Improvement: The energy conversion efficiency of a large solar cell of 50 mm2 size (square in shape) exceeds 4 percent.
The figures result from the research efforts of Dai Nippon Printing Co., Ltd. (DNP). DNP successfully presents one of effective solutions to the problem left unsolved that the energy conversion efficiency decreases as the solar cell size increases.
Sample shipping of the new solar cell will start in 2012. Commercialization of the cell will start in or before 2015.
The organic thin-film solar cell having about 5 percent (conversion efficiency) has been known. The solar cell size is small, about 2 mm2.
If the size of this solar cell is increased to 50 mm2, the conversion efficiency is about 0.1 percent at most.
To solve the problem, the DNP’ researcher established a hypothesis that the conversion efficiency decrease resulting from its size reduction might be due to the electrical energy loss that is created by heat, which is generated in the transparent conductive film when electric power generated is led to the peripheral electrodes.
A try was made to form an auxiliary electrode having a specially designed opening in the transparent conductive film by a modified photo-etching process. Provision of the auxiliary electrode such structured reduces resistance in the electric power path to the peripheral electrode, and reduces the loss by heat generated.
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