Based On The Research Acy And Its Derivatives Of Organic Photovoltaic Device

Organic materials are now widely used in various types of electronic devices,including organic light emitting diodes （OLED） and organic solar cells （OSC）. OLEDconverts electricity to light and OSC converts light to electricity. OLED and OSC havethe opposite working principles.[7-diethylamino-3-（2-thienyl）-chromen-2-ylidene]-2,2-dicyanovinylamine （ACY） and its derivatives, ACY-Cl and ACY-Br, are a kind of redfluorescent dye with good luminescence properties. In this paper, ACY and itsderivatives were used in OLED and OSC. The specific work is as follows:1. The study of OLED devices based on ACY.（1） First, the effect of the magnesium thin layer on OLED device performance wasstudied. A magnesium thin layer was insert into the Alq3electron transport layer inOLED device. Then, the optical and electrical properties of the devices were tested andanalyzed. The results showed that the device with0.5nm magnesium thin layer has thebest performance. According to the space charge conduction theory, the current-voltagecurves of OLED devices were fitted and the electron mobilities were calculated. Theresults showed that the electron mobility of the device with0.5nm magnesium thinlayer is9.67×10^-6cm²/V·s, which is the hightest and about2.5times as high as theelectron mobility of the device without magnesium thin layer. Above all, the magnesiumthin layer in the Alq3electron transport layer could improve the electron mobility ofOLED device and the OLED device performance.（2） In view of the study of the effect of the magnesium thin layer on OLED deviceperformance, the magnesium thin layer was inserted into the OLED devices based onACY. The OLED devices with the structure of ITO/NPB（20nm）/Alq₃:ACY（20nm,2wt%）/BCP（10nm）/Alq₃（40nm）/Mg（0.5nm）/Alq3（10nm）/Mg:Ag（200nm） were preparedand tested. The maximum luminance was14149cd/m²at1.82V. The turn-on voltagewas4.8V, The maximum luminous efficiency was1.90cd/A. The maximum powerefficiency was0.78lm/W.2. The study of OSC devices based on ACY, ACY-Cl and ACY-Br. （1） The HOMO and LUMO energy levels of ACY were tested by cyclicvoltammetry. The OSC devices with ACY as donor material were prepared and tested.The structure was ITO/PEDOT:PSS/MOO₃（8nm）/ACY（x nm）/C₆₀（40nm）/Bphen（10nm）/Ag（200nm）（x=10,15,20,25,30）. The results showed that when x was20, the OSCdevice has the best performance. The open circuit voltage was0.949V. The short-circuitcurrent was4.531mA/cm². The fill factor was0.385. The photoelectric conversionefficiency was1.538%.（2） The HOMO and LUMO energy levels of ACY-Cl were tested by cyclicvoltammetry. The absorption spectra and photoluminescence spectra of ACY-Cl weretested. The OSC devices with ACY-Cl as donor material were prepared and tested. Thestructure was ITO/PEDOT:PSS/MOO3（8nm）/ACY-Cl（y nm）/C60（40nm）/Bphen（10nm）/Ag（200nm）（y=15,20,25,30,40）. The results showed that when y was25, the OSCdevice has the best performance. The open circuit voltage was1.021V. The short-circuitcurrent was3.693mA/cm². The fill factor was0.340. The photoelectric conversionefficiency was1.280%.（3） The HOMO and LUMO energy levels of ACY-Br were tested by cyclicvoltammetry. The absorption spectra and photoluminescence spectra of ACY-Cl weretested. The OSC devices with ACY-Br as donor material were prepared and tested. Thestructure was ITO/PEDOT:PSS/MOO3（8nm）/ACY-Br（z nm）/C60（40nm）/Bphen（10nm）/Ag（200nm）（z=10,15,20,25,30）. The results showed that when z was20, the OSCdevice has the best performance. The open circuit voltage was0.766V. The short-circuitcurrent was1.844mA/cm². The fill factor was0.269. The photoelectric conversionefficiency was0.379%.