We have studied photocarrier recombination and relaxation dynamics in Cu2ZnSnS4 (CZTS) single crystals using a combination of various optical time-resolved spectroscopy. The band tails and deep defects govern primarily the photocarrier dynamics in CZTS. We pointed out the physical origins behind low power conversion efficiencies of CZTS-based solar cells. In addition, we found that the photocarrier lifetime increases as Na is doped in CZTS; this result implies that Na doping suppresses a part of nonradiative recombination centers in CZTS. Therefore, Na dopant is important to improve the photovoltaic performance of CZTS-based solar cells.
|Title of host publication
|2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
|Institute of Electrical and Electronics Engineers Inc.
|Published - 2015 Dec 14
|42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: 2015 Jun 14 → 2015 Jun 19
|42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
|15/6/14 → 15/6/19
- photocarrier dynamics
- sodium doping
- solar cells
- time-resolved spectroscopy
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials