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Title: Non-monotonic effect of growth temperature on carrier collection in SnS solar cells

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. However, 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 show a promising increase in the extracted minority-carrier diffusion length at the highest growth temperature of 285 °C. These findings illustrate how coupled mechanisms can affect early stage device development, highlighting the critical role of direct materials property measurements and simulation.
Authors:
; ; ; ; ; ; ; ; ;  [1] ; ;  [2]
  1. Massachusetts Institute of Technology, Cambridge, Cambridge, Massachusetts 02139 (United States)
  2. Harvard University, Cambridge, Massachusetts 02138 (United States)
Publication Date:
OSTI Identifier:
22402480
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; CHARGE COLLECTION; CONCENTRATION RATIO; DIFFUSION LENGTH; GRAIN SIZE; HALL EFFECT; HEAT TREATMENTS; QUANTUM EFFICIENCY; SIMULATION; SOLAR CELLS; TEMPERATURE RANGE 0400-1000 K; THIN FILMS; TIN SULFIDES