本研究分為兩個部份，第一部分為利用Langmuir-Blodgett 法沉積鋅紫質(ZnTPP)有機金屬紫質薄膜在ITO基板上，在第二部份中我們將有機金屬薄膜製備成有機光化學電池，以檢測有機金屬薄膜之光電化學性質，最後，因為鋅紫質(ZnTPP)吸收範圍主要在400nm-600nm的位置，我們混合CuPc以補足在長波長位置的吸收能力。
因為ZnTPP分子結構並無明顯親水端，在將ZnTPP沉積在ITO機板時，不容易沉積成LB膜，所以在沉積雙數層時會有脫落現象的發生，我們發現改變鍍膜的速度可以減少脫落現象的發生，在轉移率與層數的關係圖中，我們發現改變製程後的轉移率由負值變為0 ，由轉移率對層數的關係圖中，可以知道，在這個製程下會沉積出Z-type LB膜。
將ZnTPP沉積在ITO基板上後，製備成有機光化學電池(ITO/ZnTPP/electrolyte)，以檢測其有機薄膜光電化學性質，我們首先改變層數及成膜壓力，發現光電壓、電流隨著層數增加，這是因為沉積在基板上的ZnTPP量增加，由UV光譜圖中我們可以看到，吸收度隨著層數增加而上升，但層數達到9層後維持穩定。光電壓、電流則隨著膜壓增加而減少。
然後我們改變電解質溶液之pH值及濃度，分別使用HQ/BＱ及Ascorbic acid兩個電解質系統，觀察光電壓、電流之趨勢。發現在濃度效應中，改變HQ/BQ中BQ的濃度，光電壓、光電流會隨著濃度增加而增加，應用能士特方程式以光電壓、光電流對濃度比值的對數值做圖，斜率為33.6mV、2.45μA。改變Ascorbic acid的濃度，光電壓、光電流會隨著濃度增加而減少，斜率為-145mV、-8.2μA。
改變電解質溶液之pH值，發現光電壓隨著pH值下降，斜率分別為-26mV/pH、-22mV/pH，光電流在HQ/BQ系統中在pH=4時有一個最低點，Ascorbic acid系統中，在pH=7時有一個最高值。
為改善吸收波長不寬廣之缺點，我們混合ZnTPP及CuPc，藉由共敏化之效應，以改善薄膜之吸收特性，並利用IPCE觀察混合後，光電轉換效率的變化，發現ZnTPP分子的IPCE由15%增加到40%，CuPc由1%增加到10%。

This thesis consists of two parts. In part one, we studied the process of deposition of Zn tetraphenylporphrin (ZnTPP) thin films onto the ITO substrates by Langmuir-Blodgett technique. In part two, we studied the photoelectrochemical cell based on the ZnTPP thin films; the cosensitization of a mixed film of ZnTPP and a substituted copper phthalocyanine (4-cum)CuPc ) was also studied.
The ZnTPP molecule is not amphiphilic, thus its π-A isotherm does not show clear phase transitions. The molecular cross section measurements indicate aggregation of ZnTPP, probably due to π-πor metal-π interactions. The Z-type transfer was observed for ZnTPP onto ITO, i.e. the positive transfer ratio was observed during the lifting of the ITO substrate from the water surface. The UV-Visible spectrum of the LB film shows the typical Soret band at 425 nm and the Q band at 550 nm. The absorbances were found to increase linearly with the number of layers, up to n=9.
Photoelectric effects were observed for the photoelectrochemical cell (ITO/ZnTPP/electrolyte). We discovered that both the open-circuit voltage (Voc) and the short-circuit current (Isc) increase with the number of layers, up to n=9, and decrease with the surface pressure used to deposit the ZnTPP films.
Two electrolyte systems, HQ/BQ and ascorbic acid, were used. For the HQ/BQ electrolyte, both Voc and Isc increase linearly with log([BQ]/[HQ]), the slopes are 33.6mV and 2.45μA, respectively. For the ascorbic acid electrolyte, both Voc and Isc decrease with log [ascorbic acid], the slopes are -145mV and 8.2μA, respectively.
We also found that Voc decreases as pH increases, due to the shift of flatband potential of ZnTPP. The slopes are -26mV/pH and -22mV/pH, for HQ/BQ and ascorbic acid solutions, respectively.
A mixed film of ZnTPP and CuPc were also used. The quantum efficiency measurements show that IPCE of the mixed film is 40% at ??? nm, while that of the pure ZnTPP is 15%, and the IPCE of the mixed film is 10% at ??? nm, while that of the pure CuPc is 1%. The enhancement of quantum efficiency due to cosensitization can be explained by the hetroaggregation in the mixed film.

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