Session Index

The halide perovskites materials have received tremendous attention for various photonics applications due to their unique materials properties. In this talk, we will present various halide perovskites thin film made of different compositions and structures with their characteristics in photovoltaic, light-emitting, and optical non-linear properties. For the materials composition, complex system such as multi-cation mixed halides or pseudo halides will be introduced. Their stability in photovoltaic outperform the traditional MAPbI3 in general. Furthermore, low-dimensional 2D/3D mixed perovskites will be discussed for their improved photovoltaic performances and non-linear optical properties. Such new families of organic-inorganic hybrid semiconductors has great potential for next generation photonic devices and applications. We will report the use fully inorganic materials as electrode for perovskite solar cells. One example is the ise of IZO for electron transporting layer (ETL) and NiO as hole transporting layer (HTL) to achieve the all-inorganic selective contacts perovskite solar cells. We will present the material characteristics and the photovoltaic performances using such novel configuration. The final device demonstrated a decent power conversion efficiency over 16%. More importantly, the IZO/perovskite/NiO-based solar cells showed an impressive long-term stability under air or light-soaking conditions. With encapsulation, our device remained 85% of initial power conversion efficiency after 460 hours light soaking. This significant result reveals that high device performance, low fabrication cost and impressive light-soaking stability can be realized simultaneously by employing oxide nanoparticles as selective contacts.

 

We demonstrated perovskite random lasers on the flexible polyimide substrates with the curved perovskite thin films. Due to the low spatial coherence, the lasers exhibited excellent characteristics for low speckle imaging. Along with durability and flexible characteristics, the perovskite random lasers are promising in developing the wearable optoelectronic devices.

 

A sensitive gaseous formaldehyde sensing system is realized by integrating finger type semi-transparent photodetector and the replaceable filter paper with colorimetric type formaldehyde sensing solution. The proposed compact and low-cost system can deliver a high sensitivity (40 ppb) and exhibit a wide dynamic range (40 ppb to 1ppm).

 

Due to high surface free energy, organic siloxane with nitrogen-containing functional groups can be applied as adhesion improvement layer on plastic substrates. By adopting different modification processes, such as etching, plasma pretreatment and polymer film deposition, the adhesion between plastic substrate and optical film can be promoted in different extent.

 

In this topic, we synthesized the absorption layer of Cu2ZnSnSe4 (CZTSe) thin film solar cell with metal powder, and studied the product obtained at different selenization times at the same temperature.

 

In this study, titanium nitride nano-columnar structure was deposited with glancing angle deposition technique by DC magnetron sputtering. Both p-polarized and s-polarized reflectance and transmittance spectra of structure at angles of incidence from -70⁰ to 70⁰ were measured. The absorptance peaks associated with plasmonic modes were investigated.