Magnetic field effect and other spectroscopies of organic semiconductor and hybrid organicinorganic perovskite devices
Başlık çevirisi mevcut değil.
- Tez No: 602154
- Danışmanlar: PROF. MARKUS WOHLGENANNT
- Tez Türü: Doktora
- Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: Unıversıty Of Iowa
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
This thesis consists of three main studies: magnetic eld e ects in thermally activated delayed uorescent (TADF) organic light emitting diodes (OLEDs), magnetic eld e ects in bipolar and unipolar polythiophene (P3HT) devices and a study of hybrid organic-inorganic perovskite devices. Spin-dependent transport and recombination processes of spin-pair species have been detected by magnetic eld e ect (MFE) technique in carbon-based semiconductor devices. Magneto-electroluminescence (MEL) and magneto-conductivity have been measured as a function of the applied magnetic eld, B, in light emitting diodes. TADF materials have been used instead of simple uorescent materials in OLEDs. We have observed very large magnetic response with TADF materials. The second study is magnetic eld e ects of regio-regular P3HT based OLED devices. P3HT is a well known semiconducting polymer, and its electrical properties such as magneto-conductance can be a ected by an applied magnetic eld. P3HT was chosen because it exhibits a sign change in magnetoresistance (MR) as the bias is increased. Unipolar and bipolar devices have been fabricated with di erent electrode materials to understand which model can be best to explain organic magnetoresistance e ect, possibly depending on the operating regime of the device. Transport and luminescence spectroscopies were studied to isolate the di erent mechanisms and identify their ngerprints. The third study is on hybrid organic-inorganic perovskite devices. With the potential of achieving very high e ciencies and the very low production costs, perovskite solar cells have become commercially attractive. Scanning electron microscopy (SEM) images and absorption spectrum of the lms were compared in single-step solution, two-step solution and solution-assisted vapor deposition techniques. Grain size, morphology and thickness parameters of perovskite lms were studied within these techniques. Perovskite solar cells were fabricated and their e ciencies were measured.
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