نانومقیاس

نانومقیاس

تاثیر آهنگ لایه نشانی کاتد آلومینیوم بر عملکرد دیود نور گسیل آلی

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده فیزیک، دانشگاه دامغان، دامغان
چکیده
در این پژوهش، تاثیر آهنگ لایه نشانی کاتد آلومینیوم بر ساختار آن و عملکرد دیود نور گسیل آلی (OLED) با ساختار Glass/ITO/PEDOT:PSS/ALq3/AL بررسی شد. آهنگ لایه نشانی آلومینیوم 1/0، 5/0، 1 و nm/s 2 در نظر گرفته شد. ساختار لایه‌های آلومینیوم توسط پراش پرتو ایکس (XRD)، میکروسکپ الکترونی روبشی گسیل میدانی (FESEM) و میکروسکپ نیروی اتمی (AFM) مطالعه شدند. نتایج مشخصه یابی ساختاری نشان داد که لایه های تهیه شده با آهنگ 1/0 و nm/s 5/0 دارای ساختار بس بلوری مربوط به فاز مکعبی آلومینیوم با قله در راستای صفحه (111) می باشند. ریختار سطح لایه‌ها دانه ای است. همچنین افزایش آهنگ لایه‌نشانی آلومینیوم باعث افزایش اندازه دانه‌ها و زبری سطح آنها می‌شود. مشخصه یابی جریان – ولتاژ دیودها رفتار دیودی آنها را نشان داد. بطور کلی افزایش آهنگ لایه نشانی کاتد سبب کاهش ولتاژ آستانه دیودها می‌شود. طیف سنجی نورگسیلی دیودها نشان داد که افزایش آهنگ لایه نشانی کاتد سبب افزایش شدت نور گسیلی آنها می شود، ولی طوج موج نور گسیلی را تغییر نمی دهد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The effect of deposition rate aluminum cathode on the performance of organic light emitting diode

نویسندگان English

Fatemeh Shariatiniya
Mohammad Reza Fadavieslam
School of Physics, Damghan University, Damghan
چکیده English

In this research, the effect of aluminum cathode deposition rate on its structure and performance of organic light emitting diode (OLED) with Glass/ITO/PEDOT:PSS/ALq3 structure was investigated. The aluminum deposition rate was considered to be 0.1, 0.5, 1 and 2 nm/s. The structure of aluminum films was studied by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and atomic force microscope (AFM). The results of structural characterization showed that the films prepared with rates of 0.1 and 0.5 nm/s have polycrystalline structure corresponding to the cubic phase of aluminum with a peak in the direction of the (111) plane. The morphology of the surface of the films is granular. Also, increasing the aluminum deposition rate cause to enhancing the size of grains and their surface roughness. The current-voltage characterization of diodes showed their diode behavior. In general, increasing deposition rate decreases the threshold voltage of the diodes. Light emitting spectroscopy of diodes showed that increasing the deposition rate of cathode cause to enhancing the intensity of their emitted light, but does not change the wavelength of the emitted light.

کلیدواژه‌ها English

organic light emitting diode
aluminum cathode
deposition rate
[1] R.N. Chauhan, N. Tiwari, R. Anand, J. Kumar, Development of Al-doped ZnO thin film as a transparent cathode and anode for application in transparent organic light-emitting diodes, RSC advances, 6, 86770-86781, 2016.
[2] J.-h. Liu, F.-h. Zhang, Effect of Al: Ag alloy cathode on the performance of transparent organic light-emitting devices, Optoelectronics Letters, 13, 175-178, 2017.
[3] Y.-F. Liu, J. Feng, H.-F. Cui, Y.-F. Zhang, D. Yin, Y.-G. Bi, J.-F. Song, Q.-D. Chen, H.-B. Sun, Fabrication and characterization of Ag film with sub-nanometer surface roughness as a flexible cathode for inverted top-emitting organic light-emitting devices, Nanoscale, 5, 10811-10815, 2013.
[4] M.-H. Wu, J.-H. Lee, M.-K. Leung, Y.-N. Hsu, Voltage reduction of organic light-emitting device (OLED) with an n-type organic material and a silver cathode, in: Light-Emitting Diode Materials and Devices, SPIE, 10, 178-183, 2005.
[5] M.-G. Song, K.-S. Kim, H.I. Yang, S.K. Kim, J.-H. Kim, C.-W. Han, H.-C. Choi, R. Pode, J.H. Kwon, Highly reliable and transparent Al doped Ag cathode fabricated using thermal evaporation for transparent OLED applications, Organic Electronics, 76, 105418, 2020.
[6] H. Fujimoto, T. Miyayama, N. Sanada, C. Adachi, Origin of external quantum efficiency degradation in organic light-emitting diodes with a DC magnetron sputtered cathode, Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, 32, 060603, 2014.
[7] J. Xie, P. Li, K. Ho, G.C. Walker, Z.-H. Lu, Effect of Ag cathode deposition rate on the performance of organic light-emitting diodes, Materials Science in Semiconductor Processing, 117, 105170, 2020.
[8] S.-M. Kim, K.-H. Kim, M.-J. Keum, Deposition of an Al cathode for an OLED by using low-damage sputtering method, Journal of the Korean Physical Society, 51, 1023-1026, 2007.
[9] Z. Sun, X. Ding, B. Ding, X. Gao, Y. Hu, X. Chen, Y. He, X. Hou, Buffer-enhanced electron injection in organic light-emitting devices with copper cathode, Organic electronics, 14, 511-515, 2013.
[10] K. Bordo, H.-G. Rubahn, Effect of deposition rate on structure and surface morphology of thin evaporated Al films on dielectrics and semiconductors, Materials Science, 18, 313-317, 2012.
[11] S. Das, S. Neogi, M. Mukherjee, Effect of temperature and deposition rate on the surface morphology of thin Al metal films on glass substrate: Application in Solar Cell, in: Journal of Physics: Conference Series, IOP Publishing, 12, , 012019, 2020.
[12] H.Y. Shin, M.C. Suh, Effect of the thermal evaporation rate of Al cathodes on organic light emitting diodes, Materials Science and Engineering: B, 188, 8-12, 2014.
[13] H. Musavi, M. Fadavieslam, Improving organic light-emitting diode performance with ZnO nanoparticles, Journal of Materials Science: Materials in Electronics, 28, 7797-780, 2017.
[14] M. Malekiyan, M. Fadavieslam, m. Ardyanian, Investigation of the structural, optical and gas sensing properties of Aluminum doped zinc -oxide nanoparticles synthesized by solvothermal method, Iranian Journal of Crystallography and Mineralogy, 27, 975-984, 2019.
[15] M.R. Fadavieslam, The effect of thickness of light emitting layer on physical properties of OLED devices, Optik, 182, 452-457, 2019.
[16] M. Yahya, M. Fadavieslam, The effects of argon plasma treatment on ITO properties and the performance of OLED devices, Optical Materials, 120, 111400, 2021.
[17] S.K. Sharma, D.Y. Kim, Abnormal residual stress in nanostructured Al thin films grown on Ti/glass substrates, Current Applied Physics, 13, 1874-1879, 2013.
[18] H. Khachatryan, S.-N. Lee, K.-B. Kim, M. Kim, Deposition of Al thin film on steel substrate: the role of thickness on crystallization and grain growth, Metals, 9, 12, 2018.
[19] M. Chakaroun, R. Antony, A. Fischer, B. Ratier, A. Moliton, M. Lee, A. Boudrioua, Enhanced electron injection and stability in organic light-emitting devices using an ion beam assisted cathode, Solid state sciences, 15, 84-90, 2013.
[20] Q. Song, C. Song, Z. Zhong, Z. Hu, L. Wang, J. Wang, Y. Cao, Ether solvent treatment to improve the device performance of the organic light emitting diodes with aluminum cathode, Organic Electronics, 24, 241-245, 2015.
[21] S.K. Kim, R. Lampande, J.H. Kwon, Electro-optically efficient and thermally stable multilayer semitransparent pristine Ag cathode structure for top-emission organic light-emitting diodes, ACS Photonics, 6, 2957-2965, 2019.
[22] R. Kandulna, R. Choudhary, P. Maji, Ag-doped ZnO reinforced polymeric Ag: ZnO/PMMA nanocomposites as electron transporting layer for OLED application, Journal of Inorganic and Organometallic Polymers and Materials, 27, 1760-1769, 2017.
[23] J. Hou, G. Cheng, X. Wang, Q. Liu, X. Zhang, Efficient top-emitting organic light-emitting diodes with Sm/Ag bilayer cathode, Thin solid films, 519, 3890-3892, 2011.
[24] S.-k. Kwon, E.-H. Lee, K.-s. Kim, H.-c. Choi, M.J. Park, S.K. Kim, R. Pode, J.H. Kwon, Efficient micro-cavity top emission OLED with optimized Mg: Ag ratio cathode, Optics Express, 25, 29906-29915, 2017.

  • تاریخ دریافت 16 آذر 1401
  • تاریخ بازنگری 19 بهمن 1401
  • تاریخ پذیرش 18 اسفند 1401