A hybrid p–n junction was fabricated by using chemically synthesized cadmium sulfide (CdS) nanoparticles and spun films of poly (9-vinayl carbazole) (PVK). The junction appeared to be nearly ideal from the current–voltage measurements. The analysis of capacitance–voltage characteristics produced a value of nearly 1 V for the zero bias built-in barrier of the CdS/PVK junction. The high photoresponsivity in the order of 1.16 AW −1 at −2 V may be attributed to dissociation of loosely bound excitons at the CdS/PVK interface.
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Pradhan et al. (2009) studied this question.
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