Perovskite photodetector-based laser absorption spectroscopy for gas detection

Area of Science:

• Materials Science
• Spectroscopy
• Chemical Sensing

Background:

• Photodetectors (PDs) are crucial for various sensing applications.
• Perovskite materials like methylammonium lead iodide (MAPbI3) offer unique optoelectronic properties.
• Poly (3,4-ethylenedioxythiophene): poly (4-styrene sulfonate) (PEDOT:PSS) is a conductive polymer with potential in electronic devices.

Purpose of the Study:

• To develop and evaluate a new gas detection method utilizing MAPbI3/PEDOT:PSS composite photodetectors.
• To integrate these photodetectors into a tunable diode laser spectroscopy (TDLAS) system for gas analysis.
• To assess the performance of the system for detecting oxygen (O2).

Main Methods:

• Fabrication of MAPbI3/PEDOT:PSS composite photodetectors.
• Construction of a TDLAS system incorporating the developed photodetectors.
• Gas detection experiments targeting oxygen (O2) as the analyte.
• Performance evaluation including minimum detection limit (MDL) and Allan deviation analysis.

Main Results:

• The TDLAS system with MAPbI3/PEDOT:PSS PDs achieved a minimum detection limit (MDL) of 0.12% for O2.
• A normalized noise equivalent absorption coefficient (NNEA) of 8.83 × 10^-11 cm^-1⋅W⋅Hz^-1/2 was recorded.
• Allan deviation analysis demonstrated a sensitivity of 0.058% at an averaging time of 328 seconds.

Conclusions:

• This research presents the first application of MAPbI3/PEDOT:PSS PDs in TDLAS-based gas detection.
• The developed system offers a novel approach for spectral gas sensing, despite current performance limitations.
• Further optimization of the detector material and system integration is suggested for improved gas sensing capabilities.