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Organic photodetectors: Role of multiple donor-acceptor interfaces
Satyajit Sahu,Amlan J. Pal 한국물리학회 2007 Current Applied Physics Vol.7 No.2
We have fabricated photodetectors based on electronaccepting and electron-donating organic materials. Multiple heterojunctionsular scale. By keeping the total thickness of the devices the same, we have studied the performance of the photodetectors as a function ofthe number of such molecular-level interfaces. The results showed that the number of donoracceptor interfaces enhanced exciton dis-sociation but, at the same time, hindered charge transport by introducing energy barriers. We have shown that a trade-o between thetwo eects existed at an optimum number of donoracceptor interfaces, where the device showed better photodetector performance.