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Karbazol Temelli (D–π–A) Duyarlaştırıcı: Sentezi, Karakterizasyonu ve DSSC Uygulaması

Bu çalışmada, elektron donörü olarak karbazol çekirdeği, π-konjuge köprü olarak fenil birimleri ve elektron alıcısı olarak flor gruplarını içeren yeni bir organik karbazol bazlı donör-π-alıcı (D–π–A) duyarlaştırıcı bileşik C3 sentezlenmiş olup, ZnO bazlı boya duyarlı güneş pillerinde (DSSC'ler) boya olarak kullanılmıştır. 3,6-di(2,4-diflorofenil)-N-oktil karbazol (C3), ilk olarak halojenasyon ve alkilasyon reaksiyonu ve ikinci olarak Suzuki-Miyaura çapraz kenetlenme reaksiyonu ile iyi verimlerle sentezlenmiştir. Sentezlenen C3 duyarlaştırıcı, IR, 1H NMR ve 13C NMR ile karakterize edilmiştir. Ayrıca bu bileşiğin optik (UV-Vis ve floresans) ve termogravimetrik özellikleri de incelenmiştir. Hidrotermal yöntemlerle sentezlenen ZnO nanotozlarının kristal yapısı X-ışını kırınım spektrokopi (XRD) yöntemiyle incelendi ve hekzagonal wurtzite yapıya sahip oldukları belirlendi. Taramalı electron mikrokobu (SEM) görüntüleri ZnO nanotozlarının oldukça yoğun ve düngün yapraksı bir yapıya sahip olduklarını göstermiştir. C3 ve N719 kullanılarak ZnO tabanlı DSSC cihazlarının fabrikasyonu yapılmıştır. Metal içermeyen organik (C3), rutenyum (N719) ve karışım duyarlaştırıcılarının (C3-N719) güç dönüşüm verimleri (PCE) ve açık devre fotovoltajları (Voc) sırasıyla %0,006-0,28, %0.461-0.44 ve %0.893-0.53 olarak ölçülmüştür. N719 bazlı DSSC'lerin C3 ile artan verimi nedeniyle, C3'ün boya kümeleşmesini azalttığı ve böylece yardımcı duyarlaştırıcı olarak kullanılabileceği belirlenmiştir.

Anahtar Kelimeler:

Karbazol, Suzuki-Miyaura Çapraz Kenetlenme Reaksiyonu, Organik Yarıiletken, DSSC.

Carbazole Based (D–π–A) Sensitizer: Synthesis, Characterization and its DSSC Application

Keywords:

Carbazole, Suzuki-Miyaura Cross-Coupling Reaction, Organic Semiconductor, DSSC.,

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