P10 - Morphology Evolution of Snow-flakes Pattern and its Effect on Nano-/Micro-particles Embedded PbSe Photoconduc-tive Thin Film Characteristics
- Event
- SMSI 2025
2025-05-06 - 2025-05-08
Nürnberg - Band
- Poster
- Chapter
- Poster Session
- Author(s)
- R. Kim, S. Guduru, Y. Zhang - Laser Components Detector Group, Chandler (USA), K. Lee, J. Park - USMX Technologies LLC, Las Vegas (USA), S. Kim - University of Louisville, Louisville (USA)
- Pages
- 251 - 252
- DOI
- 10.5162/SMSI2025/P10
- ISBN
- 978-3-910600-06-5
- Price
- free
Abstract
This study focuses on optimizing the fabrication of mid-wavelength infrared (MWIR) PbSe photodetectors, widely used in commercial, medical, environmental, industrial, and military applications due to their reliable, cost-effective performance at room temperature. Using chemical bath deposition (CBD), we identified unique snowflake-like patterns on PbSe surface, containing embedded nano-prisms. These formations are linked to PbSe recrystallization during the oxygen sensitization process. The research examines how these patterns evolve—forming, expanding, and eventually reducing—under varying oxygen exposure times and temperatures. Optimal detector performance is observed when snowflake density is highest, as indicated by enhanced photoluminescent (PL) output. Beyond a specific threshold, however, increased temperature leads to a reduction in pattern size and a decline in performance. By employing spectroscopic (PL/FTIR, UV-Vis) and structural (XRD, XPS, Hall-effect) analyses, the study demonstrates that snowflake morphology serves as a visible marker of ideal CBD conditions for producing high-sensitivity PbSe photoconductive detectors.