期刊
ACS ENERGY LETTERS
卷 4, 期 9, 页码 2301-2307出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b01446
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资金
- Winton Studentship
- Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Centre in Photovoltaics (CDT-PV)
- National University of Ireland (NUI)
- European Research Council (ERC) under the European Union [756962]
- EPSRC [EP/M005143/1]
- ICON Studentship from the Lloyd's Register Foundation
- Tata Group [UF150033]
- European Commission [706552APPEL]
- Engineering and Physical Sciences Research Council (EPSRC) Centre for Doctoral Training in Plastic Electronics (PE-CDT)
- European Union [653296]
- Oppenheimer Studentship
- Royal Society
- EPSRC [EP/M005143/1, 1948703, EP/R023980/1] Funding Source: UKRI
Mixed lead tin halide perovskites have sufficiently low bandgaps (similar to 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 mu s 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.
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