Non-monotonic effect of growth temperature on carrier collection in SnS solar cells
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Harvard Univ., Cambridge, MA (United States)
We quantify the effects of growth temperature on material and device properties of thermally evaporated SnS thin-films and test structures. Grain size, Hall mobility, and majority-carrier concentration monotonically increase with growth temperature. Yet, the charge collection as measured by the long-wavelength contribution to short-circuit current exhibits a non-monotonic behavior: the collection decreases with increased growth temperature from 150 °C to 240 °C and then recovers at 285 °C. Fits to the experimental internal quantum efficiency using an opto-electronic model indicate that the non-monotonic behavior of charge-carrier collection can be explained by a transition from drift- to diffusion-assisted components of carrier collection. The results reflect a promising increase in the extracted minority-carrier diffusion length at the highest growth temperature of 285 °C. These findings demonstrate how coupled mechanisms can affect early stage device development, highlighting the critical role of direct materials property measurements and simulation.
- Research Organization:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; National Science Foundation (NSF)
- Grant/Contract Number:
- EE0005329
- OSTI ID:
- 1547010
- Alternate ID(s):
- OSTI ID: 1226742
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 20; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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journal | February 2016 |
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