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Microsecond Carrier Lifetimes, Controlled p-Doping, and Enhanced Air Stability in Low-Bandgap Metal Halide Perovskites.
- Source :
-
ACS energy letters [ACS Energy Lett] 2019 Sep 13; Vol. 4 (9), pp. 2301-2307. Date of Electronic Publication: 2019 Aug 21. - Publication Year :
- 2019
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Abstract
- Mixed lead-tin halide perovskites have sufficiently low bandgaps (∼1.2 eV) to be promising absorbers for perovskite-perovskite tandem solar cells. Previous reports on lead-tin perovskites have typically shown poor optoelectronic properties compared to neat lead counterparts: short photoluminescence lifetimes (<100 ns) and low photoluminescence quantum efficiencies (<1%). Here, we obtain films with carrier lifetimes exceeding 1 μs and, through addition of small quantities of zinc iodide to the precursor solutions, photoluminescence quantum efficiencies under solar illumination intensities of 2.5%. The zinc additives also substantially enhance the film stability in air, and we use cross-sectional chemical mapping to show that this enhanced stability is because of a reduction in tin-rich clusters. By fabricating field-effect transistors, we observe that the introduction of zinc results in controlled p-doping. Finally, we show that zinc additives also enhance power conversion efficiencies and the stability of solar cells. Our results demonstrate substantially improved low-bandgap perovskites for solar cells and versatile electronic applications.<br />Competing Interests: The authors declare the following competing financial interest(s): Dr. Samuel D. Stranks is a co-founder of Swift Solar Inc. Prof. Henry J. Snaith FRS is a co-founder of Oxford PV.
Details
- Language :
- English
- ISSN :
- 2380-8195
- Volume :
- 4
- Issue :
- 9
- Database :
- MEDLINE
- Journal :
- ACS energy letters
- Publication Type :
- Academic Journal
- Accession number :
- 31544151
- Full Text :
- https://doi.org/10.1021/acsenergylett.9b01446