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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/199435
Inkjet‐Printed p‐NiO/n‐ZnO Heterojunction Diodes for Photodetection Applications
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Transparent Conducting Oxides (TCOs) are an enticing family of optoelectronic materials which have been proven to increase efficiency when incorporated into perovskite light emitting diode (PE-LED) and organic OLED architectures as transport layers. Solution-processed metal oxide inks have already been demonstrated, although there is still a need for high-quality inkjet-printable metal oxide inks with a thermal post-process below 200 °C. The set of inks in this work are adapted from low-boiling point colloidal suspensions of metal oxide nanoparticles synthesized via flame spray pyrolysis. High quality, pinhole- and wrinkle-free inkjet-printed layers are obtained at low temperatures through vacuum oven post process, as proven by scanning electron microscopy. The crystallinity of the layers is confirmed by X-ray diffraction, showing the expected hexagonal and cubic structures respectively for ZnO and NiO. The thin film layers reach over 70% (ZnO) and 90% (NiO) transparency in the visible spectrum. Their implementation in the inkjet-printed p-n diode shows excellent I-V rectifying behavior with an ON/OFF ratio of two orders of magnitude at ±3 V and a forward threshold voltage of 2 V. Furthermore, the device exhibits an increase in photocurrent around four orders of magnitude when illuminated under a 1-sun solar simulator.
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GONZÁLEZ, Sergio, et al. Inkjet‐Printed p‐NiO/n‐ZnO Heterojunction Diodes for Photodetection Applications. Advanced Materials Interfaces. 2022. Vol. 10, num. 15, pags. 1-8. ISSN 2196-7350. [consulted: 20 of August of 2026]. Available at: https://hdl.handle.net/2445/199435