Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates Zbigniew Łukasiak Andrzej Korcala, Przemysław Płóciennik, Anna Zawadzka.

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Presentation transcript:

Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates Zbigniew Łukasiak Andrzej Korcala, Przemysław Płóciennik, Anna Zawadzka Department of Technical and Applied Physics Faculty of Physics, Astronomy and Informatics Nicolaus Copernicus University - Toruń

Outline Introduction Sample preparation Porous silicon (PSi) copper phthalocyanine – by PVD Characterisation by time resolved spectroscopy Results for PSi and PSi/CuPc Summary Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Why porous silicon is interesting? Science: Porous Si is silicon structure and bulk Si is inefficient at emitting light, even at cryogenic temperatures. Economy: Simple technology and low costs. Technology: Silicon is the most technologically important material, dominating the microelectronics revolution that influences our everyday lives. Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Porous silicon Si mixture of nanostructures A - silicon wafer (substrate) B - wires (>500 nm) C - quantum wires (1-100 nm) D , G - nanocrystallites (1-10 nm) E - oxide layer F - contact layer surface to volume ratio 200 - 1000 m2/cm3 Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Preparation of porous silicon Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Copper phthalocyanine (CuPc) small-molecule organic material used as a hole transport layer in OLED and OPV structures Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Thin films preparation by PVD (thermal evaporation in vacuum) Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Characterisation by time resolved photoluminescence for nitrogen laser sample ~200 s - for porous silicon ~5 ns PM transient recorder S photomultiplier Boxcar, digital oscilloscope, RTMS Filter (monochromator) L Pulse Laser Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Time resolved spectra & decay curves INTENSITY OBSERVATION WAVELENGTH constant wavelength, changed delay decay curves of luminescence constant delay, changed wavelength luminescence time resolved spectra TIME Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Photoluminescence time-resolved spectra for different delays 0, 5μs, 10μs, 20μs, 40μs, 60μs, 80μs, 100μs,150μs Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Photoluminescence (decomposed as a sum of few Gaussians) Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Decay of photoluminescence Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Recombination radiative (slow decay) defect tunnelling nonradiative (fast decay) radiative (slow decay) Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Conclusions PL spectra of PSi/CuPc exhibit the same multiband structure like for fresh prepared PSi. The results shows that origin of PL is the same for fresh and organic coated samples. The organic material penetrates deep into PSi skeleton and influences generation and recombination processes of carriers in PSi structure. The results are interesting for aplication of PSi as a part of hybrid PSi-organic photovoltaic devices or selective gas detectors (“electrical noses”) Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Thank you for your attention Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Relaxation of carriers in PSi structure Wr - radiative recombination (slow) Wnr - nonradiative recombination (fast) Wij - migration between different zones of structure (very slow) „loses” delayed injection Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Model of luminescence Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates

Future NOT ONLY LEDs flat displays solar cells gas sensors humidity sensors „electronic noses” enviroment monitoring blood diagnostics implants - „cyberbones” explosives ! Study of Small-Molecule Thin Organic Films Deposited on Porous Silicon Substrates