• DEPARTMENT OF PHYSICS AND ASTRONOMY
• HEIDELBERG UNIVERSITY
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# KIP publications

 year 2012 author(s) S. Tengeler title Analyse dotierbedingter spektraler Änderungen am System α-NPD:MoO3 mit Infrarot-Spektroskopie KIP-Nummer HD-KIP 12-69 KIP-Gruppe(n) F6 document type Diplomarbeit Abstract (en) In the context of this work thematerials Alpha -NPD and MoO3, as well as samples of varying Alpha -NPD:MoO3 dopingconcentration have been investigated. The measured spectra of Alpha -NPD have beencompared, and found to be in good agreement with calculations based on densityfunctional theory. In situ measurements in the middle infrared range show spectralchanges of the vibronic excitation as a function of the doping concentration. Theintensity of spectral change has been determined via an optical model in the analyticalsoftware SCOUT and fits nicely with the formation of Alpha -NPD:MoO3 chargetransfer complexes in the film. Using this approach the efficiency of charge transferfor MoO3 in Alpha -NPD has been determined to 6.5 %. Additional ex situ measurementsin the near infrared range show a similar behavior as a function of the dopingconcentration for an electronic excitation, which has already been assigned to anAlpha -NPD:MoO3 charge transfer complex in the literature. By comparing the twoobserved excitations this assignment has been verified, and by usage of DFT basedcalculations of the Alpha -NPD cation extended to the vibronic excitations. bibtex @mastersthesis{TengelerDip, author = {Tengeler, Sven}, title = {{Analyse dotierbedingter spektraler Ã„nderungen am System $\alpha$-NPD:MoO$_3$ mit Infrarotspektroskopie}}, school = {Ruprecht-Karls-Universit{\"{a}}t}, year = {2012}, type = {Diplomarbeit} }
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