Kelvin probe force microscopy (KPFM)
KPFM is also known as surface potential microscopy, is a noncontact variant of atomic force microscopy (AFM). With KPFM, the work function of surfaces can be observed at atomic or molecular scales.
X-Ray Diffraction (XRD)
X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions.
Electron beam deposition system
Electron-beam physical vapor deposition (PVD) is a form of physical vapor deposition in which a target material is bombarded with an electron beam under a high vacuum level (∼10-7 torr). The E-beam system at KMUTT is used for preciously preparing a thin electron-transporting layer for our efficient perovskite solar cells.
Time-Resolved Photoluminescence (TRPL)
Photoluminescence lifetime is an intrinsic characteristic of a luminescent character that provides insight into the species excited state dynamics. Time-Resolved Photoluminescence (TRPL) is a choice for studying the electronic processes that result in the emission of photons– a process called fluorescence.
External Quantum Efficiency (EQE)
EQE-R quantum efficiency system is a PV cell tester that can provide cell EQE. IPCE, IQE, and spectral response data accurately and rapidly. The figure on the right shows the EQE spectra and the corresponding integrated current densities of the SnO2 (an ETL layer) and modified PSCs.
Electrochemical impedance/ UV-vis spectrometers
EIS is a nondestructive electrical characterization method to investigate the charge dynamics in the bulk and/or interfaces of different perovskite materials with both electronic and ionic behaviors.
UV-Vis Spectroscopy (or Spectrophotometry) is a quantitative technique used to measure how much a sample absorbs light. This could be done by measuring the intensity of light that passes through a sample with respect to the intensity of light through a reference sample or blank.
Dual (DC/RF) magnetron sputtering sources
Nitrogen purged glovebox
Within an inert atmosphere glove box, the use of dry nitrogen will also lower the oxygen content within equipment reducing any oxidation effects. These well-controlled atmosphere are most commonly used for preparing a high quality perovskite layers in our laboratory. It is used generally to prevent unwanted chemical reaction that may be degrading our sample.
Ultrasonic sprayed coating
Ultrasonic spray nozzles are constructed to vibrate longitudinally at high frequency by means of piezoelectric transducers. Within a collaborative work with Dr. Supasai in nano-photovoltage laboratory (http://nano-pv.sci.ku.ac.th/), the chemical-sprayed nebulous system has been designed and setup for low-cost thin film preparation. The utilization of co-misted generators containing different chemical sources benefits to prepare materials in different stoichiometries.
Thermal Evaporation System
Within a collaborative work with Assoc. Professor Dr. Supasai in nano-photovoltage laboratory (http://nano-pv.sci.ku.ac.th/).