Tozhiboy Mirzamakhmudov among fellow scientists and students
In this scientific center of Vilnius, he actively continued his scientific activities, choosing for himself a very interesting scientific direction. He was interested in the occurrence of abnormally high photovoltage in semiconductor films. For example, on one centimeter of such a semiconductor, it was possible to get as much as 2,000 Volts (!), which was just an amazing result, requiring theoretical justification for itself, as well as a number of proofs.
His works did not remain without a trace and already in 1979, Tozhiboy Mirzamakhmudovich defended his doctoral dissertation at the same Vilnius State University on this burning topic: “The occurrence of abnormally high photovoltage in semiconductor films and new principles for the creation of optoelectronic devices.” It is worth noting that in the subject of the dissertation, not only the justification of the phenomenon itself is derived, but also its practical application for the creation of optoelectronic devices that increase their efficiency is proposed.
But as time went on, the love for the Motherland became stronger and stronger, increasing the desire to once again contemplate such dear lands of Uzbekistan, their relatives, two sons and a daughter, as well as the Fergana Polytechnic Institute (FerPI), which has already become almost native. That is why he returned to Uzbekistan in 1980 to FerPI and since that time his activities have been closely connected with the Polytechnic Institute. There he begins to head the Faculty of Energy.
At the time of 1982, he, being at the very dawn of his strength, at the age of 41, saw the next fruits of his labors – the higher attestation commission awarded the academic title of professor to Also Mirzamakhmudovich. From 1984 to 1987, Tozhiboy Mirzamakhmudovich took the honorary post of vice-rector of the evening correspondence department of the Fergana Polytechnic Institute, actively continuing his scientific activities, but the craving for knowledge, the thirst for creation continued to torment him, which is why from 1987 to 1991 he assumed the post of vice-rector for Research, where he was able to plunge again into the amazing world of science and creation.
Mirzamakhmudov was widely known and recognized for his work in the field of research of photoresistive and photoelectric phenomena in semiconductor film elements. To put it more simply, these film elements transmitted energy when illuminated, but in its absence they did not immediately lose it, but reduced the amount of transmitted current very evenly, up to a certain amount, which they stored like a memory element!
In this field, Mirzamakhmudov and a group of his students conducted a series of studies on the development and study of photo-portrait elements, those very memory cells that arise due to the internal field of p-n transitions. For the first time in the world, photoelectric elements from triple semiconductor compounds were discovered, that is, if single or binary compounds were previously used and their properties were already studied, then triple compounds were discovered here for the first time, surprisingly their properties were much more complex than binary, not to mention single cases. And in 1988, under the leadership of Mirzamakhmudov, a new effect was first revealed – an abnormally high photoelectromagnetic voltage without an external field in two film semiconductor materials, which meant that not only when an electric current passed through the crystals, but also through the film, the Hall effect was observed – a deviation of electron flows in a magnetic field, along with the fact that the current flowed and straight, deviating a little, so even in the film it was possible to separate the charge.
During his long scientific career, which lasted more than 50 years, Mirzamakhmudov published more than 100 scientific papers, two monographs received more than 10 author’s certificates. He is the author of several methodological manuals and the editor of textbooks on theoretical physics. Some of his works have been published in Bulgaria, Czechoslovakia and Japan. At the initiative of Tozhiboy Mirzamakhmudovich, many scientific laboratories studying the most pressing issues and problems of modern science of that time were opened at the Fergana Polytechnic Institute, a postgraduate school and small commercial enterprises were established, and a research laboratory for the study of the physicochemical properties of semiconductor solar cells was established under his direct supervision.
Tozhiboy Mirzamakhmudovich devoted a lot of effort and energy to establishing scientific contacts with leading centers and universities of the country. Mirzamakhmudov had the ability to see a future scientist in a student and a young specialist, to direct his activities in the direction of scientific research. More than twenty PhD theses have been defended under his leadership.
The results of the research of the Institute’s employees who worked under the leadership of Mirzamakhmudov are widely implemented today in the field of physics, mathematics, chemistry and other sciences. And many of his scientific works continue to be published posthumously, honoring his memory, a vivid example of this is the textbook “Electronics Asoslari” published in 2022, co-authored by his student B. Karimov.
The great scientist continued his work, leaving behind a great legacy not only in the face of his numerous works, but also not small students who are now candidates, doctors of sciences, professors, and some have already gone with their teacher to another world.
Tozhiboy Mirzamakhmudovich himself left our world on November 9, 2009, leaving behind the great memory of the great scientist…
PHYSICAL SCIENCES
THE USE OF NEW NANOSTRUCTURE METHODS ALLOWING TO INCREASE THE MONOCHROMATICITY OF THE BEAM DURING ACCELERATION
UDC 621
Rinat Fuadovich Rumi
Senior Researcher, Head of the Laboratory of Accelerator Technology at the Research Institute “Physics of Semiconductors and Microelectronics” at the National University of Uzbekistan
Laboratory of Accelerator Technology at the Research Institute “Physics of Semiconductors and Microelectronics” at the National University of Uzbekistan, Tashkent, Uzbekistan
Abstact. The development of accelerator technology has been actively observed after numerous works by Ernest Rutherford, from the discovery of the planetary model and the implementation of the first nuclear reaction to the present day. And it is worth noting that for each time there were quite interesting requirements for charged particle beams, among which the most popular requirement at almost all times was the beam energy, then its current can be noted, but one of the most important among them is the monochromaticity of the charged particle beam.
Keywords: monochromaticity, monoenergetics, charged particle beam, accelerator, nanostructures.
Аннотация. Развитие ускорительной техники наблюдалось активно после многочисленных работ Эрнеста Резерфорда, от открытия планетарной модели и осуществления первой ядерной реакции до сегодняшний дней. И стоит отметить, что для каждого времени существовали довольно интересные требования к пучкам заряженных частиц, среди коих самым