Electron spin resonance and transmission electron microscopy studies of solution‐grown CdTe thin films

1988 ◽  
Vol 53 (10) ◽  
pp. 865-867 ◽  
Author(s):  
G. K. Padam ◽  
S. K. Gupta
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Transmission Electron ◽  
Spin Resonance ◽  
Cdte Thin Films

Transmission Electron Microscopy of Shock-Modified and Annealed Rutile

1983 ◽  
Vol 24 ◽  
Author(s):  
M. J. Carr ◽  
R. A. Graham ◽  
B. Morosin ◽  
E. L. Venturini
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Shock Treatment ◽  
Line Broadening ◽  
Annealing Behavior ◽  
X Ray ◽  
Transmission Electron ◽  
Spin Resonance

ABSTRACTThe annealing behavior of shock modified rutile (TiO2) powder was studied by transmission electron microscopy, x-ray line broadening, and electron spin resonance. Specimens were examined in the as-received and as-shocked conditions, and in shocked and annealed conditions after one hour at 475° or 1000°C. The dislocations generated by the shock treatment were found to persist essentially unaltered through the 475°C anneal. Substantial recovery was observed after the 1000°C anneal.

Transmission Electron Microscopy Study of the Microstructure of Np- Etched CdTe Thin Films

2001 ◽  
Vol 7 (S2) ◽  
pp. 558-559
Author(s):  
K.M. Jones ◽  
Y. Yan ◽  
F.S. Hasoon ◽  
M.M. Al-Jassim
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Device Fabrication ◽  
Back Contact ◽  
Transmission Electron ◽  
Cdte Thin Films ◽  
Cdte Surface

Polycrystalline CdTe is a promising candidate for solar cells due to its nearly ideal band-gap, high absorption coefficient, and ease of film fabrication. Small-area CdTe/CdS cells with efficiencies of 16.0% have been demonstrated. The structure of a typical CdTe/CdS solar cell (Figure 1) consists of a glass superstrate, on which a thin layer of SnO2 is deposited (front contact), n-type CdS, p-type CdTe, and a back contact. Prior to applying the back contact to the CdTe, etching of the CdTe surface using a mixture of nitric and phosphoric (NP) acids is normally needed. It is known that the etching depletes a crystalline CdTe surface of Cd and creates a Te-rich layer. Two effects of the Te-rich layer has been proposed, namely, forming a Te-CdTe low-series-resistance contact and improving CdTe device stability by the gettering of Cu. Thus, the NP etching is an important process in the CdTe device fabrication. in this paper, we report on transmission electron microscopy (TEM) study of the microstructure of the surface of NP etched CdTe thin films.

Transmission Electron Microscopy Study of Planar Defects in Polycrystalline CdTe Thin Films

2001 ◽  
Vol 7 (S2) ◽  
pp. 556-557
Author(s):  
Y. Yan ◽  
K.M. Jones ◽  
M.M. Al-Jassim
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Stacking Faults ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Extended Defects ◽  
Transmission Electron ◽  
Cdte Thin Films ◽  
High Absorption Coefficient

CdTe is a promising photovoltaic material due to its near optimum band gap and high absorption coefficient. Polycrystalline, thin-film CdTe/CdS solar cells have demonstrated an efficiency of 15.8%. High density of extended defects is often found in polycrystalline CdTe films grown by close-spaced sublimation (CSS). So far, most investigations of defects in CdTe have focused on epitaxially grown films, and the reported extended defects are mainly lamellar twins. However, epitaxially grown films generally have a different microstructure compared to CSS grown polycrystalline CdTe thin films. in this paper, we report our study of extended defects in CSSgrown polycrystalline CdTe thin films by high-resolution transmission electron microscopy (HRTEM). We found that the extended defects are mostly lamellar twins and stacking faults. The stacking faults always propagate across the grains, without ending at a partial dislocation inside the grains.

Lysolecithin–Cholenterol Interaction. A Spin-Resonance and Electron-Micrographic Study

1975 ◽  
Vol 53 (2) ◽  
pp. 196-206 ◽  
Author(s):  
A. D. Purdon ◽  
J. C. Hsia ◽  
L. Pinteric ◽  
D. O. Tinker ◽  
R. P. Rand
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Membrane Structure ◽  
Phase Changes ◽  
Cholesterol Concentration ◽  
Spectral Change ◽  
Physiological Temperature ◽  
Spin Resonance

Another publication (Rand, R. P., Pangborn, W., Purdon, A. D., and Tinker, D. O. (1975) Can. J. Biochem. 53, 189–195) has established that lysolecithin and cholesterol interact to form an equimolar complex. We have investigated this complex using the techniques of electron spin resonance (e.s.r.) and electron microscopy. By varying the cholesterol concentration with lysolecithin in both thin films and dispersions studied by these techniques, we have observed the interaction between lysolecithin and equimolar complex below 50 mol% cholesterol, and between crystalline cholesterol and equimolar complex above 50 mol% cholesterol. We have observed an interesting alteration in morphology by electron microscopy, and an isotropic to anisotropic spectral change using 3-doxylcholestane and 12-doxylstearic acid spin-labelled probes when the cholesterol concentration is increased from 20 to 33 mol%. The equimolar complex is stable in the presence of crystalline cholesterol, and exhibits no phase changes in the physiological temperature range. Implications for membrane structure are discussed.

Transmission Electron Microscopy studies of texture of Cr underlayer of magnetic recording hard disk

1991 ◽  
Vol 49 ◽  
pp. 580-581
Author(s):  
L. Tang ◽  
G. Thomas ◽  
M. R. Khan ◽  
S. L. Duan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Magnetic Recording ◽  
Magnetic Thin Films ◽  
Magnetic Films ◽  
Substrate Bias ◽  
Epitaxial Relationship ◽  
Transmission Electron

Cr thin films are often used as underlayers for Co alloy magnetic thin films, such as Co1, CoNi2, and CoNiCr3, for high density longitudinal magnetic recording. It is belived that the role of the Cr underlayer is to control the growth and texture of the Co alloy magnetic thin films, and, then, to increase the in plane coercivity of the films. Although many epitaxial relationship between the Cr underlayer and the magnetic films, such as ﹛1010﹜Co/ {110﹜Cr4, ﹛2110﹜Co/ ﹛001﹜Cr5, ﹛0002﹜Co/﹛110﹜Cr6, have been suggested and appear to be related to the Cr thickness, the texture of the Cr underlayer itself is still not understood very well. In this study, the texture of a 2000 Å thick Cr underlayer on Nip/Al substrate for thin films of (Co75Ni25)1-xTix dc-sputtered with - 200 V substrate bias is investigated by electron microscopy.

Transmission Electron Microscopy of Evaporated Perylene Thin Films

1990 ◽  
Vol 48 (2) ◽  
pp. 336-337
Author(s):  
C. Ewins ◽  
J.R. Fryer
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Molecular Electronics ◽  
High Vacuum ◽  
Amorphous Layer ◽  
Electric Heater ◽  
Transmission Electron ◽  
Polycyclic Aromatic

The preparation of thin films of organic molecules is currently receiving much attention because of the need to produce good quality thin films for molecular electronics. We have produced thin films of the polycyclic aromatic, perylene C10H12 by evaporation under high vacuum onto a potassium chloride (KCl) substrate. The role of substrate temperature in determining the morphology and crystallography of the films was then investigated by transmission electron microscopy (TEM).The substrate studied was the (001) face of a freshly cleaved crystal of KCl. The temperature of the KCl was controlled by an electric heater or a cold finger. The KCl was heated to 200°C under a vacuum of 10-6 torr and allowed to cool to the desired temperature. The perylene was then evaporated over a period of one minute from a molybdenum boat at a distance of 10cm from the KCl. The perylene thin film was then backed with an amorphous layer of carbon and floated onto copper microscope grids.

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