Utilization of Natural Porphyrin Thin Films as a Photosensitizer for Photodetectors

2014 ◽  
Vol 896 ◽  
pp. 187-191 ◽  
Author(s):  
Utari ◽  
Atmanto Heru Wibowo ◽  
Budi Purnama ◽  
Kamsul Abraha

In this study, photodetectors were assembled using natural porphyrin as a sensitizer, and their energy gap properties were investigated. The natural porphyrin thin film layered devices used in the experiments were deposited by spin coating on a patterned electrode of Cu printed circuit board substrates. The photo sensitive characteristics were measured both with and without illumination by white light. The photo sensitive effect increased with the number of layers. A maximum current of 2.6 nA was obtained when the films consisted of three layers and the current increased to 7.9 nA for seven layers. To clarify the results, the dependence of the number of layers on the energy gap was evaluated. The experiment results showed that the energy gap decreased linearly with increasing number of layers. The mutual combination of the photo sensitive effect and energy gap indicated that it is possible to apply natural porphyrin as a sensitizer for photodetector applications.

2007 ◽  
Vol 47 (4-5) ◽  
pp. 755-758 ◽  
Author(s):  
Jong-Hyun Park ◽  
Cheng-Ji Xian ◽  
Nak-Jin Seong ◽  
Soon-Gil Yoon ◽  
Seung-Hyun Son ◽  
...  

2013 ◽  
Vol 49 ◽  
pp. 320-324 ◽  
Author(s):  
Klaus Zimmer ◽  
Martin Ehrhardt ◽  
Pierre Lorenz ◽  
Tino Stephan ◽  
Robby Ebert ◽  
...  

2014 ◽  
Author(s):  
Jung Woon Lim ◽  
Seon Hoon Kim ◽  
Jong-Sup Kim ◽  
Jeong Ho Kim ◽  
Yune Hyoun Kim ◽  
...  

2007 ◽  
Vol 124-126 ◽  
pp. 1369-1372 ◽  
Author(s):  
Seung Woo Han ◽  
Ki Jeong Seo ◽  
Wan Doo Kim ◽  
Hak Joo Lee ◽  
Hyun Woo Lee ◽  
...  

Flexible printed circuit board (PCB), which is used for folder and slide type cellular phones, consists of flexible copper clad laminate (FCCL) and cover layer. Through it an electric current is applied to liquid crystal display (LCD) from the main board of cellular phone. In thin Cu foils of flexible PCB fatigue cracks due to repeated bending motion generate and propagate, and they cause a short circuit. Fatigue behavior of thin Cu foils being used for flexible PCB must be evaluated and confirmed to resolve this problem. It is based on findings by several researches that the mechanical properties of thin film materials differ from those of their bulk counterparts. Thin film properties have been investigated over the last years; however fatigue behavior of thin films has not yet been studied as thoroughly as monotonic behavior. In this study fatigue properties of thin Cu foils for the application in flexible PCB are obtained. Fatigue testing was performed for two kinds of Cu foils that were made by rolling and electrochemical procedures respectively. Differences of fabrications in fatigue behavior of thin foils were distinguished. Especially for rolled Cu foils, effects of rolling directions in fatigue properties were evaluated.


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