Goal By doping TiO 2 with both Cr and N, it is hoped to decrease - - PowerPoint PPT Presentation

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Goal By doping TiO 2 with both Cr and N, it is hoped to decrease - - PowerPoint PPT Presentation

Feb 08, 2023 401 likes •741 views

Goal By doping TiO 2 with both Cr and N, it is hoped to decrease the band gap of the parent insulating TiO 2 to achieve a photovoltaic device that could operate in the visible region. Samples Powder Cr/N TiO 2 : N was not stable

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SLIDE 1

Goal

  • By doping TiO2 with both Cr and N, it is

hoped to decrease the band gap of the parent insulating TiO2 to achieve a photovoltaic device that could operate in the visible region.

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SLIDE 2

Samples

  • Powder Cr/N TiO2: N was not stable
  • Amorphous 3% Cr, N, and Cr/N TiO2 300C
  • Rutile 5% Cr/N TiO2: 350C-800C
  • Anatase 3% N TiO2: 350C-800C
  • Rutile Cr, N, and Cr/N TiO2 700C
  • Rutile Cr/N TiO2 700C diff pressure
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SLIDE 3

Nitrogen

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SLIDE 4

N K XAS

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SLIDE 5

N only TiO2 300C (noncry)

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SLIDE 6

Cr/N TiO2 300C (noncry)

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SLIDE 7

N-K XAS

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SLIDE 8

Cr/N 350C Rutile (uncalibrated)

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SLIDE 9

Cr/N 550C Rutile (uncalibrated)

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SLIDE 10

Cr/N 800C Rutile

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SLIDE 11

Difference Spectra

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SLIDE 12

N K Anatase TiO2

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SLIDE 13

Cr, N, Cr/N TiO2 700C

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SLIDE 14

Cr/N Rutile 700C

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SLIDE 15

N Rutile 700C

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SLIDE 16

Cr/N 3x10-4T 5-24-10

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SLIDE 17

TiN

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SLIDE 18

Oxidized TiN

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SLIDE 19
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SLIDE 20

Oxygen and Chromium

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SLIDE 21

Cr, Cr/N, and undoped TiO2 300C

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SLIDE 22

O K and Cr L2,3 edges

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SLIDE 23

Cr, N, Cr/N TiO2 700C

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SLIDE 24

Titanium

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SLIDE 25

TiO2 and Cr/N TiO2 300C

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SLIDE 26

Undoped TiO2 300C (not normalized)

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SLIDE 27

Cr/N TiO2 300C (not normalized)

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SLIDE 28

Ti L2,3 edge

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SLIDE 29

Ti L2,3 edge

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SLIDE 30

Ti Emission ALS June 2010

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SLIDE 31

Cr/N TiO2 800C Rutile

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SLIDE 32

Optical Absorption