Electron-Spin Resonance of Type II Si-Clathrate Thin Film for New Solar Cell Material

2016 ◽  
pp. 213-219
Author(s):  
Mitsuo Yamaga ◽  
Takumi Kishita ◽  
Tetsuji Kume ◽  
Koki Uehara ◽  
Masaki Nomura ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Spin Resonance ◽  
Solar Cell ◽  
Electron Spin ◽  
Type Ii ◽  
Cell Material ◽  
Spin Resonance ◽  
Solar Cell Material

Electron Spin Resonance Investigations on Perovskite Solar Cell Materials Deposited on Glass Substrate

MRS Advances ◽  
2018 ◽  
Vol 3 (32) ◽  
pp. 1831-1836
Author(s):  
C. L. Saiz ◽  
E. Castro ◽  
L. M. Martinez ◽  
S. R. J. Hennadige ◽  
L. Echegoyen ◽  
...  
Keyword(s):  
Electron Spin Resonance ◽  
Solar Cell ◽  
Line Width ◽  
Electron Spin ◽  
Glass Substrate ◽  
Esr Spectra ◽  
Perovskite Solar Cell ◽  
Hole Transport ◽  
Ex Situ ◽  
Spin Resonance

ABSRTACTIn this article, we report low-temperature electron spin resonance (ESR) investigations carried out on solution processed three-layer inverted solar cell structures: PC61BM/CH3NH3PbI3/PEDOT:PSS/Glass, where PC61BM and PEDOT:PSS act as electron and hole transport layers, respectively. ESR measurements were conducted on ex-situ light (1 Sun) illuminated samples. We find two distinct ESR spectra. First ESR spectra resembles a typical powder pattern, associated with gx = gy = 4.2; gz = 9.2, found to be originated from Fe3+ extrinsic impurity located in the glass substrate. Second ESR spectra contains a broad (peak-to-peak line width ∼ 10 G) and intense ESR signal appearing at g = 2.008; and a weak, partly overlapped, but much narrower (peak-to-peak line width ∼ 4 G) ESR signal at g = 2.0022. Both sets of ESR spectra degrade in intensity upon light illumination. The latter two signals were found to stem from light-induced silicon dangling bonds and oxygen vacancies, respectively. Our controlled measurements confirm that these centers were generated during UV-ozone treatment of the glass substrate –a necessary step to be performed before PEDOT:PSS is spin coated. This work forms a significant step in understanding the light-induced- as well as extrinsic defects in perovskite solar cell materials.

The Roles of Several E′ Variants in Thermal Gate Oxide Reliability

1994 ◽  
Vol 338 ◽  
Author(s):  
John F. Conley ◽  
P.M. Lenahan ◽  
H.L. Evans ◽  
R.K. Lowry ◽  
T.J. Morthorst
Keyword(s):  
Thin Film ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Vacuum Ultraviolet ◽  
Charge Injection ◽  
Charge Trapping ◽  
Gate Oxide ◽  
Oxide Reliability ◽  
Spin Resonance ◽  
Thermally Grown

ABSTRACTWe combine electron spin resonance measurements with vacuum ultraviolet, ultraviolet, and corona bias charge injection schemes to examine the properties and charge trapping roles of three E′ variants in conventionally processed thermally grown thin film SiO2 on Si.

Electron Spin Resonance in GaN Thin Film Doped with Fe

2007 ◽  
Vol 46 (2) ◽  
pp. 581-585 ◽  
Author(s):  
Takanari Kashiwagi ◽  
Saki Sonoda ◽  
Haruhiko Yashiro ◽  
Yujiro Ishihara ◽  
Akira Usui ◽  
...  
Keyword(s):  
Thin Film ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Spin Resonance

Non-Equivalence and Inverse Allosteric Response of the α and β Chains in Haemoglobins. An Electron Spin Resonance Study of NO-Ligated Hb Kansas

1976 ◽  
Vol 31 (11-12) ◽  
pp. 664-674 ◽  
Author(s):  
Hans Twilfer ◽  
Klaus Gersonde
Keyword(s):  
Electron Spin Resonance ◽  
Spin Density ◽  
Electron Spin ◽  
Hyperfine Splitting ◽  
Esr Spectra ◽  
Type I ◽  
Type Ii ◽  
High Ph ◽  
Spin Resonance ◽  
Spectral Components

Abstract The electron spin resonance (ESR) spectra of 15NO- and 14NO-ligated Hb Kansas have been measured at 77 K in the range of pH 5 to 10. At low pH the ESR spectrum is the composite of a type I and a type II spectrum which changes to another composite of a type I and type II spectrum at high pH. For the definition of type I and type II spectra and the correlation of these types with two tertiary conformation states see Overkamp et al., Z. Naturforsch. 31 c , 524 [1976]. Both, the type I and the type II spectra observed at low and high pH respectively are different with regard to g-tensors and hyperfine-splitting constants. Therefore at intermediate pH values the ESR spectra of NO-Hb Kansas are the composites of four spectral components. The assignments of the four spectral components to the a and the β chains are arrived at from the comparison of the ESR spectra of the α2Mmet β2NO and of the α2MNO β2NO species of Hb M Iwate. α and β chains are both characterized by a pH-dependent spectral transition from a type I to a type II spectrum. The chains are non-equivalent with regard to both the type I and the type II spectra. The type I spectra assigned to the a and the β chains are characterized by g*zz = 2.0095 with a hyperfine splitting of a*zz (15NO) = 2.36 mT and gzz = 2.0085 with a hyperfine splitting of a*zz(15NO) = 2.41 mT respectively. The type II spectra assigned to the α and the β chains are characterized by g*′zz = 2.005 and a hyperfine splitting of a*′zz (15NO) = 3.07 mT and g′zz=2.005 and a hyperfine splitting of a′zz (15NO) = 3.31 mT. The change of the hyperfine splitting at gzz during the transition from type I to type II corresponds to an increase of the spin density at the NO by about 25% in both types of chains. Comparison of type I spectra of the NO-ligated α and β chains respectively demonstrates that the spin density at the NO is larger in the β chains than in the oc chains. The spectral types are correlated with functional states defined by the kinetics of NO-binding. Binding of inositol hexaphosphate has no influence on the ESR spectra in the whole range of pH as it is expected if NO-Hb Kansas is in the quaternary T structure.

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