<P>Lead halide perovskites present a versatile class of solution-processable semiconductors with highly tunable bandgaps that span ultraviolet, visible, and near-infrared portions of the spectrum. We explore phase-separated chloride and iodide l...
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
https://www.riss.kr/link?id=A107650937
2019
-
SCOPUS,SCIE
학술저널
9583-9593(11쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>Lead halide perovskites present a versatile class of solution-processable semiconductors with highly tunable bandgaps that span ultraviolet, visible, and near-infrared portions of the spectrum. We explore phase-separated chloride and iodide l...
<P>Lead halide perovskites present a versatile class of solution-processable semiconductors with highly tunable bandgaps that span ultraviolet, visible, and near-infrared portions of the spectrum. We explore phase-separated chloride and iodide lead perovskite mixtures as candidate materials for intermediate band applications in future photovoltaics. X-ray diffraction and scanning electron microscopy reveal that deposition of precursor solutions across the MAPbCl<SUB>3</SUB>/MAPbI<SUB>3</SUB> composition space affords quasi-epitaxial cocrystallized films, in which the two perovskites do not alloy but instead remain phase-segregated. First-principle calculations further support the formation of an epitaxial interface and predict energy offsets in the valence band and conduction band edges that could result in intermediate energy absorption. The charge dynamics of variable mixtures of the relatively narrow bandgap (1.57 eV) MAPbI<SUB>3</SUB> perovskite and wide bandgap (3.02 eV) MAPbCl<SUB>3</SUB> are probed to map charge and energy flow direction and kinetics. Time-resolved photoluminescence and transient absorption measurements reveal charge transfer of photoexcited carriers in MAPbCl<SUB>3</SUB> to MAPbI<SUB>3</SUB> in tens of picoseconds. The rate of quenching can be further tuned by replacing MAPbI<SUB>3</SUB> with two-dimensional Ruddlesden-Popper (BA)<SUB>2</SUB>(MA)<SUB><I>n</I>−1</SUB>Pb<I><SUB>n</SUB></I>I<SUB>3<I>n</I>+1</SUB> (<I>n</I> = 3, 2, and 1) perovskites, which also remain phase-separated.</P>
[FIG OMISSION]</BR>
Porous Graphene-Carbon Nanotube Scaffolds for Fiber Supercapacitors