“…In addition, another fascinating application is organic rectifying diodes for radio-frequency identification tags [1][2][3]. Various rectifying diodes have been exploited, these include metal/organic [4,5], inorganic/organic [6,7] and p-i-n organic/organic [8,9] semiconductor heterojunctions. The organic rectifying diode based on simple small molecular organic/organic heterojunctions is rare, and in fact has not been reported to date although the potential rectifying behaviors have been observed in organic photovoltaic cell devices based on planar donor-acceptor heterojunctions [10,11].…”