Halojen Atomları ve Siyano Grubunun Hekzasen Molekülünün Optik, Elektronik ve Yük Transfer Özellikleri Üzerine Etkisinin İncelenmesi: Moleküler Dizayn Yöntemi, Yapı-Özellik İlişkisi

Year 2020, Volume: 15 Issue: 2, 330 - 342, 29.11.2020

Gül Yakalı

https://doi.org/10.29233/sdufeffd.811263

Abstract

Bu çalışmada, π-konjugasyon yapısına sahip hekzasen molekülü, farklı halojen atomlar (Flor, Klor, Brom) ve molekülde farklı konumlandırılmış siyano grupları ile dizayn edilmiş, elektronik, optik ve yük transfer özellikleri zamana bağlı ve zamandan bağımsız Yoğunluk Fonksiyon Teorisi (YFT) ile incelenmiştir. Dizayn edilen beş hekzasen türevinin yapı ve özellik arasındaki ilişkiyi kurabilmek için, moleküler geometri, reorganizasyon enerji, HOMO-LUMO orbital enerjileri, iyonizasyon potansiyeli (IP), elektron afinitesi (EA), geometriden dolayı nötr ve yüklü durumlara bağlı olarak bağ uzunluğu değişimi (BUD) üzerine substitüe etkisi incelenmiş ve etkiyi daha iyi anlayabilmek için sonuçlar hekzasen ve antrasen moleküllerin sonuçlarıyla karşılaştırılmıştır. Moleküllerin, elektron enjeksiyon bariyerinin hekzasen molekülünden daha düşük olduğu ve iyi bir boşluk taşıyıcısı olarak bilinen antrasenle kıyaslanabilir derecede etkili boşluk yük transfer oranına sahip olduğu belirtilmiştir. Dizayn edilen hekzasen türevlerinin, optoelektronik alanda potansiyel uygulamalar için ilgi çekebileceğini ve malzeme biliminde umut vaad edeceğini umuyorum.

Keywords

İyonizasyon potansiyeli, Yoğunluk fonksiyon teorisi, Elektron afinitesi, Reorganizasyon enerji, , Marcus teori, Yük taşıma oranı

Studying the Effect of Halogen Atoms and the Cyano Groups on Optical, Electronic and Charge Transfer Properties of Hexasene Molecule: Molecular Design Methods, Structure-Property Relationship

Abstract

In this study, the π-conjugated hexacene molecule was designed with different halogen atoms (Fluorine, Chlorine, Bromine), differently positioned cyano groups and its electronic, optical and charge transfer properties were investigated by time-dependent and time-independent Density Functional Theory (DFT). The substituent effect on the molecular geometry, reorganization energy, frontier orbitals, ionization potential (IP) and bond length alternation (BLA) depending on nötr and charged states, electronic affinity (EA) of the five molecules were investigated to establish the relationship between structures and properties .To gain a better understanding of the substituent effect on the charge transport property, the results of designed molecules were compared with hexacene and antracene molecules. The electron injection barrier of the new designed molecules is lower than hexacene molecule and have more effective hole charge transfer property which is comparable to that of antracene known as a good hole charge carrier. I belived that, new designed hexacene derivatives may be used as optoelectronic devices which could attract great attention in material sciences.

Keywords

Density functional theory, Iyonization potential, Electron affinity, Reorganization energy, Marcus theory, Charge carrier rate

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