Study of photocurrent generation in InP nanowire-based p+-i-n+ photodetectors
Jain V, Nowzari A, Wallentin J, Borgstrom MT, Messing ME, Asoli D, Graczyk M, Witzigmann B, Capasso F, Samuelson L, Pettersson H (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 7
Pages Range: 544-552
Journal Issue: 4
DOI: 10.1007/s12274-014-0422-2
Abstract
We report on electrical and optical properties of p+-i-n+ photodetectors/solar cells based on square millimeter arrays of InP nanowires (NWs) grown on InP substrates. The study includes a sample series where the p+-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p+-segment length. Without a p+-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a p+-segment decouples the substrate and shifts the depletion region, and collection of photogenerated carriers, to the NWs, in agreement with theoretical modeling. In optimized solar cells, clear spectral signatures of interband transitions in the zinc blende and wurtzite InP layers of the mixed-phase i-segments are observed. Complementary electroluminescence, transmission electron microscopy (TEM), as well as measurements of the dependence of the photocurrent on angle of incidence and polarization, support our interpretations. [Figure not available: see fulltext.] © 2014 Tsinghua University Press and Springer-Verlag Berlin Heidelberg.
Authors with CRIS profile
Involved external institutions
Harvard University
United States (USA) (US)
Lund University / Lunds universitet
Sweden (SE)
Universität Kassel
Germany (DE)
United States (USA) (US)
Lund University / Lunds universitet
Sweden (SE)
Universität Kassel
Germany (DE)
How to cite
APA:
Jain, V., Nowzari, A., Wallentin, J., Borgstrom, M.T., Messing, M.E., Asoli, D.,... Pettersson, H. (2014). Study of photocurrent generation in InP nanowire-based p+-i-n+ photodetectors. Nano Research, 7(4), 544-552. https://dx.doi.org/10.1007/s12274-014-0422-2
MLA:
Jain, Vishal, et al. "Study of photocurrent generation in InP nanowire-based p+-i-n+ photodetectors." Nano Research 7.4 (2014): 544-552.
BibTeX: Download