T. Elmore, J. Candler, F. Yakuphanoglu and R.K. Gupta  (2015) “Carrier Transport Mechanism of Copper Phthalocyanine Based Photodiode for Solar Cell Applications”, Journal of Solar Energy Research Updates, 2(1), pp. 18–23. doi: 10.15377/2410-2199.2015.02.01.4.