發(fā)布時(shí)間：2018-07-04 21:44

  本文選題：有機(jī)光耦 + 光敏異質(zhì)結(jié)��； 參考：《清華大學(xué)》2016年博士論文

【摘要】：從上世紀(jì)40年代開始,社會(huì)信息化進(jìn)程飛速前進(jìn),傳統(tǒng)的無機(jī)電子器件面臨新的挑戰(zhàn),新興的有機(jī)電子學(xué)得到了迅猛發(fā)展。作為一種新型的半導(dǎo)體器件,有機(jī)光電耦合器件(OOC)具有良好的信號(hào)隔離和傳輸性能,在低成本和柔性光電領(lǐng)域中有著重要的應(yīng)用前景。在本論文中,我們利用有機(jī)發(fā)光二極管(OLED)為輸入單元,有機(jī)光敏異質(zhì)結(jié)二極管(OPD)為輸出單元,從有機(jī)半導(dǎo)體材料、界面能級(jí)以及光場(chǎng)分布等方面探索了光生載流子的產(chǎn)生和傳輸機(jī)制,通過提高各個(gè)單元的效率,制備了高性能的OOC器件,并探索其在不同領(lǐng)域的應(yīng)用。本論文的工作主要分為以下三個(gè)方面:1.采用m-MTDATA/C60異質(zhì)結(jié)體系為光敏單元,藍(lán)色OLED為光源,制備了OOC器件。利用光場(chǎng)分布模擬探索了OPD中異質(zhì)結(jié)厚度與光電流的關(guān)系,通過肖特基勢(shì)壘的消除以及體異質(zhì)結(jié)的引入,提高了OPD的光敏效率。在此基礎(chǔ)上,我們采用雙面氧化銦錫(ITO)基底,實(shí)現(xiàn)光耦的單片集成,提高光傳輸效率。最后利用疊層藍(lán)光OLED,使電流轉(zhuǎn)換比CTR提高到2.2%,超過了部分商業(yè)化無機(jī)光耦的水平,有望應(yīng)用于高效光耦器件的制備。另外雙面ITO基底的引入還實(shí)現(xiàn)了電極分離,減小寄生電容,器件的截止頻率和隔離電壓分別提高到了250 k Hz和3000 V。2.采用高效光敏ISQ染料,以疊層紅光OLED為光源,制備了紅光響應(yīng)的OOC。通過光場(chǎng)分布模擬,電極/有機(jī)界面能級(jí)調(diào)控等途徑,CTR最終達(dá)到了4.4%。在此基礎(chǔ)上,通過引入電子和空穴阻擋層材料,器件暗電流顯著降低。此紅光響應(yīng)OOC有望應(yīng)用于未來夜視成像、遙感控制等軍工領(lǐng)域。隨后,我們采用具有寬吸收光譜,較高載流子遷移率和擴(kuò)散長(zhǎng)度的CH3NH3Pb I3材料,制備了高性能的光敏單元,以高效白光疊層OLED為光源,光響應(yīng)度達(dá)到1 A/W(@341.3μW/cm2),CTR達(dá)到263.3%,這是目前已報(bào)道的最大值。3.我們開發(fā)了OOC在低壓控制電路、載流子遷移率測(cè)試新方法、以及壓力傳感等方面的應(yīng)用。還發(fā)展了一種可自驅(qū)動(dòng)的有機(jī)摩擦光電耦合器件,實(shí)現(xiàn)了不同強(qiáng)度、不同頻率的信號(hào)傳遞。這些應(yīng)用的開發(fā)有望滿足光電子器件在未來智能化、個(gè)人化、便攜化以及可穿戴領(lǐng)域的需求。
[Abstract]:Since the 1940s, with the rapid progress of social informatization, the traditional inorganic electronic devices are facing new challenges, and the new organic electronics has been developed rapidly. As a new type of semiconductor device, organic photocoupler (OOC) has good signal isolation and transmission performance, and has an important application prospect in low cost and flexible optoelectronic field. In this thesis, we use organic light emitting diodes (OLEDs) as input cells and organic Guang Min heterojunction diodes (OPDs) as output cells from organic semiconductor materials. The generation and transmission mechanism of photogenerated carriers are explored in the aspects of interface energy levels and light field distribution. High performance OOC devices are fabricated by improving the efficiency of each unit and their applications in different fields are explored. The work of this paper is divided into the following three aspects: 1. Using m-MTDATA-C60 heterojunction system as Guang Min cell and blue OLED as light source, OOC devices are fabricated. The relationship between the thickness of heterojunction and photocurrent is investigated by using the optical field distribution simulation. The efficiency of Guang Min is improved by eliminating Schottky barrier and introducing bulk heterojunction. On this basis, we adopt double sided indium tin oxide (ITO) substrate to realize the monolithic integration of optical coupling and improve the optical transmission efficiency. Finally, by using laminated blue OLED, the current conversion ratio of CTR is increased to 2.2, which exceeds the level of partially commercial inorganic optical coupling, and is expected to be used in the fabrication of high-efficiency optical coupling devices. In addition, the introduction of double-sided ITO substrate also realizes electrode separation and reduces parasitic capacitance. The cut-off frequency and isolation voltage of the device are increased to 250kHz and 3000 V. 2, respectively. Red light responsive OOCs were prepared by using high efficiency Guang Min ISQ dyes and laminated red OLED as light source. Through the simulation of the light field distribution, the CTR of the electrode / organic interface is finally up to 4.4 by regulating the energy level of the electrode / organic interface. On this basis, the dark current of the device is significantly reduced by the introduction of electron and hole barrier materials. The red light response OOC is expected to be used in the future night vision imaging, remote sensing control and other military fields. Subsequently, high performance Guang Min cells were prepared by using CH3NH3PbI3 with wide absorption spectrum, high carrier mobility and diffusion length. The photoresponsivity reached 1 A / W (341.3 渭 W / cm ~ 2) and CTR reached 263.3%, which is the maximum reported. We have developed the applications of OOC in low voltage control circuits, new methods of carrier mobility measurement, and pressure sensing. An organic friction photocoupler which can drive itself is also developed, which can transmit signals with different intensity and frequency. These applications are expected to meet the future needs of optoelectronic devices in the fields of intelligence, personalization, portability and wearability.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN622

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