ﺗﺎﺛﯿﺮ دﻣﺎ و ﻓﺮﮐﺎﻧﺲ ﺑﺮ ﺧﻮاص اﻟﮑﺘﺮﯾﮑﯽ ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﻓﺘﺎﻟﻮﺳﯿﺎﻧﯿﻦ ﮐﻠﺮواﯾﻨﺪﯾﻮم-ﭘﻠﯽ ﭘﯿﺮول

Influence of Temperature and Frequency on Electrical Properties Nanocomposite Chloroindium Phthalocyanine-Polypyrrole

در اﯾﻦ ﭘﮋوﻫﺶ ﺧﻮاص اﻟﮑﺘﺮﯾﮑﯽ و ﺳﺎﺧﺘﺎري ﻧﺎﻧﻮ ﮐﺎﻣﭙﻮزﯾﺖ ﻓﺘﺎﻟﻮﺳﯿﺎﻧﯿﻦ ﮐﻠﺮواﯾﻨﺪﯾﻮم و ﭘﻠﯽ ﭘﯿﺮول (ClInPc ₊ Ppy) ﺑﺮرﺳﯽ ﺷﺪه اﺳﺖ. در اﺑﺘﺪا ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ در درﺻﺪﻫﺎي 5% و 15% و 25% ﺳﻨﺘﺰ ﺷﺪ و ﺳﭙﺲ ﻗﻄﻌﺎت ﺳﺎﻧﺪوﯾﭽﯽ ﺑﺎ اﺳﺘﻔﺎده از دﺳﺘﮕﺎه ﻻﯾﻪ ﻧﺸﺎﻧﯽ ﺗﺒﺨﯿﺮ ﺑﺎرﯾﮑﻪ اﻟﮑﺘﺮوﻧﯽ ﺗﺤﺖ ﺧﻼ 10-5 ﻣﯿﻠﯽﺑﺎر آﻣﺎده ﺷﺪ. ﻇﺮﻓﯿﺖ و ﻋﺎﻣﻞ اﺗﻼف اﯾﻦ ﻗﻄﻌﺎت در ﺑﺎزهي ﻓﺮﮐﺎﻧﺴﯽ (10به توان 5) -100 ﻫﺮﺗﺰ و ﺑﺎزه ي دﻣﺎﯾﯽ 383-308 ﮐﻠﻮﯾﻦ اﻧﺪازه ﮔﯿﺮي ﺷﺪه اﺳﺖ ﮐﻪ ﻧﺸﺎن ﻣﯽدﻫﺪ ﻇﺮﻓﯿﺖ و ﻋﺎﻣﻞ اﺗﻼف ﺑﺎ اﻓﺰاﯾﺶ ﻓﺮﮐﺎﻧﺲ ﮐﺎﻫﺶ ﻣﯽﯾﺎﺑﻨﺪ. واﺑﺴﺘﮕﯽ رﺳﺎﻧﻨﺪﮔﯽ اﻟﮑﺘﺮﯾﮑﯽ ﺑﻪ ﻓﺮﮐﺎﻧﺲ ﺑﺎ راﺑﻄﻪ σac(ω) = Aωs ﺗﻮﺿﯿﺢ داده ﻣﯽﺷﻮد ﮐﻪ ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ اﯾﻦ راﺑﻄﻪ ﻣﮑﺎﻧﯿﺰمﻫﺎي رﺳﺎﻧﺶ ﺣﺎﻣﻞﻫﺎ ﻣﺸﺨﺺ ﻣﯽ ﺷﻮد. ﻏﺎﻟﺐ ﺑﻮدن ﻫﺮ ﻣﮑﺎﻧﯿﺰم رﺳﺎﻧﺶ واﺑﺴﺘﻪ ﺑﻪ ﺷﺮاﯾﻂ آزﻣﺎﯾﺶ و ﺑﺎزه ﻫﺎي دﻣﺎﯾﯽ و ﻓﺮﮐﺎﻧﺴﯽ اﺳﺖ، ﮐﻪ در اﯾﻦ ﺗﺤﻘﯿﻖ ﻣﮑﺎﻧﯿﺰم ﻫﻮﭘﯿﻨﮓ ﻏﺎﻟﺐ اﺳﺖ. اﻧﺮژي ﻓﻌﺎل ﺳﺎزي ﺑﺮاي اﻧﺘﻘﺎل اﻟﮑﺘﺮونﻫﺎ ﺑﺮاي ﺳﻪ درﺻﺪ ﻣﺘﻔﺎوت ﮐﺎﻣﭙﻮزﯾﺖ ﻣﺤﺎﺳﺒﻪ ﺷﺪه ﮐﻪ ﻧﺸﺎن ﻣﯽ دﻫﺪ اﻧﺮژي ﻓﻌﺎل ﺳﺎزي ﺑﺎ اﻓﺰودن درﺻﺪ ﭘﻠﯿﻤﺮ رﺳﺎﻧﺎ ﮐﺎﻫﺶ ﯾﺎﻓﺘﻪ اﺳﺖ. وﺿﻌﯿﺖ ﻣﻮرﻓﻮﻟﻮژي ﺳﻄﺢ ﺗﻮﺳﻂ ﻣﯿﮑﺮوﺳﮑﻮپ اﻟﮑﺘﺮوﻧﯽ روﺑﺸﯽ ﮔﺴﯿﻞ ﻣﯿﺪاﻧﯽ FESEM ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ.

In this research work, the AC electrical properties of nanocomposite chloroindium phthalocyanine-polypyrrole were studied. Nanocomposites (ClInPc+%5 PPy) & (ClInPc+%15 PPy) & (ClInPc+%25 PPy) were synthesized and Subsequently sandwich devices (Al/ClInPc+PPy/Al) were prepared on pre-cleaned glass substrates, which were deposited in a high vacuum device of the electron-beam gun in the pressure of 10-5 mbar. Capacitance and Dissipation factor were measured in the range of 102-105 Hz frequency and 307-383 K temperatures. the capacitance and loss factor reduced by increasing the frequency and enhanced by increasing the temperatures. The AC electrical properties thin films of our materials are in good agreement with Goswami and Goswami model. The dependence of the electrical conductivity on the frequency is analyzed by the equation σ(ω) = AωS which is typical for charge transport. The dominance of each mechanism depends on the experimental conditions and the temperature and frequency intervals. In this present research, the conduction mechanism is specified with hopping models. furthermore, the activation energies of the device are achieved as a function of frequency. The surface morphology of the nanocomposite thin film was investigated by field emission scanning electron microscope (FESEM) images.