These studies are reporting the development of optoelectronic devices using full vacuum deposition process during the doctoral studies. The first part is the development of the efficient exciplex-based OLEDs device using different structure. At first we compared the interfacial- and bulk-exciplex system with performance exhibit EQE of 26.4% and 7.7%, respectively. The bulk-exciplex could optimize the exciton formation inside the device as more charge is distributed inside the emission layer. In the following phase, we demonstrate the optimal adjustment between donor and acceptor materials in the bulk-exciplex system by using synthesize phenylcarbazole-based material as the host material. The high EQE of 31.5% was obtained by utilizing the donor and acceptor intermolecular interaction to achieve higher triplet state, thus promote the exciton formation. The optical and electrical measurement is used to analyze the exciplex formation inside the system.
The second part is optimizing the perovskite photodetecor (PPD) using three materials FAI, CsBr, and PbI2. Our optimize device has high on/off ratio of 107 order, specific detectivity (D*) recorded around 1013 order, and comparable photocurrent response with silicon-based PD (Newport 818-SL25). Our device can maintain 95% of their performance upon exposure to one sun illumination. The electrochemical impedance spectroscopy (EIS) measurement is utilized for examining device charge dynamics during varied exposure durations to understand the degradation mechanism.
Third part is developing perovskite gas sensor using all vacuum deposition process. The FACsPbI2Br device shows response over 76% with response and recovery time 39s and 110s under 10 ppm concentrations of NO gases. Our device shows good selectivity toward other gases such as NH3, SO2 and CO2. We discovered that the CsBr additive could extend the bare film lifespan for three days when placed under ambient surrounding. The lower surface film roughness demonstrates the ability to restrain oxygen and moisture pathways, resulting in longer lifetime.

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