Demonstration of electrical performance of QGBF polysilicon solar cell structure

Small-area p/n junction photodiodes have been fabricated on Wacker polysilicon material using the novel concept of quasi-grain-boundary-free (QGBF) solar cells. The use of small-area structures simulates the predominance of grain-boundary recombination in determining the conversion efficiency in small-grain polysilicon solar cells. The electrical performance of the QGBF test photodiodes is shown to be comparable to single crystal photodiodes fabricated on the same wafer.