幾種有機(jī)半導(dǎo)體分子載流子遷移特性的研究
發(fā)布時(shí)間：2018-10-19 12:11
【摘要】：由于有機(jī)半導(dǎo)體材料受分子間弱相互作用的影響,載流子的躍遷速率相對較低。針對這一特點(diǎn),本文基于Marcus跳躍模型對低聚噻吩衍生物、雙并四苯衍生物以及Naphthalenediimide (NDTI)衍生物的載流子輸運(yùn)特性、遷移率進(jìn)行了研究。得到如下結(jié)論：2,5-二(噻吩-2-基)噻吩[3,2-b]噻吩(T-T2-T)遷移率相對較大,可以達(dá)到0.226 cm2V-1s-1;分子有效共軛長度對重組能、相鄰分子間耦合作用以及載流子遷移率產(chǎn)生影響。雙并四苯衍生物較高的遷移率主要得益于較小的重組能和較大的相鄰分子間有效耦合。長碳鏈的引入對重組能的大小幾乎無影響。但長碳鏈的引入會導(dǎo)致分子間相對密集的堆積。這種密集的堆積方式可能會促進(jìn)分子間的相互耦合作用,減小載流子在相鄰分子間的有效擴(kuò)散,從而導(dǎo)致遷移率的降低。基于對C8-NDTI遷移率的研究,通過對其簡諧振動(dòng)模式和鍵長弛豫分析,討論了各化學(xué)元素對重組能的影響。發(fā)現(xiàn)：O元素會降低空穴轉(zhuǎn)移過程中的重組能,同時(shí)增加相鄰分子間的有效耦合,這有利于提高載流子遷移率。
[Abstract]:Due to the weak intermolecular interaction, the carrier transition rate is relatively low. In this paper, the carrier transport characteristics and mobility of thiophene derivatives, bis-tetraphenyl derivatives and Naphthalenediimide (NDTI) derivatives are studied based on Marcus hopping model. The results are as follows: the mobility of 2o 5- (thiophene 2-yl) thiophene [3H 2-b] thiophene (T-T2-T) is relatively large, and the effective conjugation length of 0.226 cm2V-1s-1; can influence the recombination energy, the coupling between adjacent molecules and the carrier mobility. The higher mobility of bis-tetraphenyl derivatives is mainly due to the smaller recombination energy and the larger effective coupling between adjacent molecules. The introduction of long carbon chains has little effect on the size of recombination energy. However, the introduction of long carbon chains will lead to a relatively dense accumulation of molecules. This dense stacking pattern may promote the interaction between molecules and reduce the effective diffusion of carriers between adjacent molecules, resulting in a decrease in mobility. Based on the study of the mobility of C8-NDTI, the influence of each chemical element on the recombination energy is discussed through the analysis of the simple harmonic vibration mode and bond length relaxation. It is found that O can decrease the recombination energy in the hole transfer process and increase the effective coupling between adjacent molecules, which is beneficial to increase the carrier mobility.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN304
本文編號：2281073
[Abstract]:Due to the weak intermolecular interaction, the carrier transition rate is relatively low. In this paper, the carrier transport characteristics and mobility of thiophene derivatives, bis-tetraphenyl derivatives and Naphthalenediimide (NDTI) derivatives are studied based on Marcus hopping model. The results are as follows: the mobility of 2o 5- (thiophene 2-yl) thiophene [3H 2-b] thiophene (T-T2-T) is relatively large, and the effective conjugation length of 0.226 cm2V-1s-1; can influence the recombination energy, the coupling between adjacent molecules and the carrier mobility. The higher mobility of bis-tetraphenyl derivatives is mainly due to the smaller recombination energy and the larger effective coupling between adjacent molecules. The introduction of long carbon chains has little effect on the size of recombination energy. However, the introduction of long carbon chains will lead to a relatively dense accumulation of molecules. This dense stacking pattern may promote the interaction between molecules and reduce the effective diffusion of carriers between adjacent molecules, resulting in a decrease in mobility. Based on the study of the mobility of C8-NDTI, the influence of each chemical element on the recombination energy is discussed through the analysis of the simple harmonic vibration mode and bond length relaxation. It is found that O can decrease the recombination energy in the hole transfer process and increase the effective coupling between adjacent molecules, which is beneficial to increase the carrier mobility.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN304
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 陳海明;靳寶善;;有機(jī)半導(dǎo)體器件的現(xiàn)狀及發(fā)展趨勢[J];微納電子技術(shù);2010年08期
，本文編號：2281073
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