VIETNAM NATIONAL UNIVERSITY, HANOI SOCIALIST REPUBLIC OF VIETNAM UNIVERSITY OF TECHNOLOGY AND ENGINEERING Independence – Freedom – Happiness
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INFORMATION ON MASTER’S THESIS
1. Full name : PHAN VU THI VAN 2. Sex: Female
3. Date of birth: 13/6/1994 4. Place of birth: NAM DINH 5. Admission decision number: 1095/QĐ-CTSV Dated 23/12/2016
6. Changes in academic process: ... ...
(List the forms of change and corresponding times)
7. Official thesis title: Study and fabrication organic-inorganic halide perovskite materials based optoelectronic.
8. Major: Faculty of Engineering Physics and Nanotechnology (FEPN) 9. Code: 8440126.01 QTD.
10. Supervisors: Dr. Nguyen Tran Thuat and Dr. Dang Dinh Long.
11. Summary of the findings of the thesis:
(Summarize them with stress on the new findings, if any)
Recently, Organic-inorganic hybrid perovskite materials have been attracted a lot of attention of scientists in the research community because of their excellent properties.
These properties include simple fabrication processes, absorption and emission ability, excellent carrier mobility and tunable optical band gap. The first fabrication of a all solid- state perovskite solar cell by Nam Gyu Park and co-workers. After that we have observed a phenomenal increase of photoelectric conversion efficiency from 3.9% in 2009 to 22.7%
in 2017. In addition, perovskite materials have been applied in making light emitting diode, with the highest external quantum efficiency of 8.53% for visible light emission and of 11.7% for infrared emission.
In this study, following results have been obtained:
CH3NH3PbBr3 perovskite has been synthesized by dropping method.
CH3NH3PbBr3 crystals were characterized by photoluminescence at different excited power at 532 nm of wavelength, showing a second order emitted peak at 564-569 nm.
CH(NH2)2PbBr3 perovskite has been synthesized by dropping and spin coating methods.CH(NH2)2PbBr3 crystals were characterized by photoluminescence at
different excited power at 532 nm, showing a second order emitted peak at 555 nm- 563 nm. UV- Vis absorption spectra showed a peak at approximate 535 nm. X-ray diffraction was used to characterize these thin films, showing the cubic crystalline phase.
(C6H5C2H4NH3)2PbI4 two-dimensional perovskite has been synthesized by dropping and spin coating methods. The structural property of (C6H5C2H4NH3)2PbI4
thin films was characterized by X-ray diffraction, showing a triclinic phase. UV-Vis absorption spectra showed a excitonic peak at approximate 520 nm.
(C6H5C2H4NH3)2PbI4 thin films was characterized by photoluminescence at different excited wavelength at 405 nm, showing the peak at 525 nm and 554.3 nm.
(CH)4(NH2)8PbBr6 one-dimensional perovskite has been synthesized by dropping method. X-ray diffraction showed that (CH)4(NH2)8PbBr6 possessed a monoclinic structure. (CH)4(NH2)8PbBr6 crystals was characterized by photoluminescence, excited at 325 nm, showing a wide peak from 400 to 800 nm.
Perovskite solar cells with structure fluorine doped tin oxide /poly (3,4- ethylenedioxythiophene): polystyrene /CH(NH)2PbBr3/ZnO:Al/Ag have been successfully fabricated. A best solar cell with following parameters: Voc = 0.14V, Jsc
= -2.666 mA, FF = 0.254, PCE = 0.095%, has been obtained
Simple light emitting diodes have been fabricated basing on CH(NH)2PbBr3. Light emission at 570 nm at room temperature have been observed.
12.Practical applicability, if any: ... ...
12. Further research directions, if any: ... ...
13. Thesis-related publications: ... ...
1. Thi Van Phan Vu, Minh Tu Nguyen, Dam Thuy Trang Nguyen, Tien Dung Vu, Duc Long Nguyen. Ngoc Mai An, Minh Hieu Nguyen, Cong Doanh Sai, Van Diep Bui, Chi Hieu Hoang, Thanh Tu Truong, Ngoc Diep Lai, Thuat Nguyen-Tran,
“Three-Photon Absorption Induced Photoluminescence in Organo-Lead Mixed Halide Perovskites”, Journal electronic material, June 2017, Volume 46, Issue 6, pp 3622–3626.
Ha Noi, 10 October 2018 Signature
Nguyen Tran Thuat Dang Dinh Long
Ha Noi, 10 October 2018 Signature
Phan Vu Thi Van
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