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Photosensitive CuFeO2/n-InSe Heterojunctions

Authors: Tkachuk, I.G.; Orletskii, I.G.; Ivanov, V.I.; Zaslonkin, A.V.; Kovalyuk, Z.D.;

Photosensitive CuFeO2/n-InSe Heterojunctions

Abstract

Методом низькотемпературного спрей-піролізу виготовлено фоточутливі анізотипні гетеропереходів CuFeO2/n-InSe. На нагріту до 623 K підкладку InSe розпилювався водний розчин солей двохлористої міді CuCl2∙2H2O і трихлористого заліза FeCl3∙6H2O. В результаті отримувались плівки CuFeO2 р-типу із товщиною ~ 0,3 мкм та шириною забороненої зони 2,6 еВ. Контакти формувалися з використанням струмопровідної пасти на основі срібла. Проведено дослідження ВАХ при температурах від 295 до 336 K. Показано, що температурна залежність висоти потенціального бар'єру є лінійною. На основі аналізу температурних залежностей прямих та обернених ВАХ встановлено динаміку зміни енергетичних параметрів та з'ясовано роль енергетичних станів на межі гетеропереходу у формуванні контактної різниці потенціалів. Проведено апроксимацію ВАХ в рамках моделі, що враховує вплив послідовного та шунтуючого опорів. Знайдено значення діодного коефіцієнту, послідовного та шунтуючого опорів гетеропереходу. Визначено механізми формування прямого та зворотного струмів через енергетичний бар'єр CuFeO2/n-InSe. Досліджено спектральну залежність квантової ефективності опроміненої з боку CuFeO2 гетероструктури в діапазоні енергій фотонів від 1,2 до 3,2 еВ. Проаналізовано вплив поглинання світла в матеріалах гетероструктури на її загальну фоточутливість. Отримані результати підтверджують перспективність гетероструктур CuFeO2/n-InSe для фотоелектроніки. Photosensitive anisotypic CuFeO2/n-InSe heterojunctions were fabricated by the method of lowtemperature spray pyrolysis. An aqueous solution of copper dichloride CuCl2∙2H2O and iron trichloride FeCl3∙6H2O was sprayed onto the InSe substrate heated to 623 K. As a result, p-type CuFeO2 films with a thickness of ~ 0.3 µm and a band gap of 2.6 eV were obtained. Contacts were formed using silver-based conductive paste. The I-V characteristics were studied at temperatures from 295 to 336 K. It was shown that the temperature dependence of the height of the potential barrier is linear. Based on the analysis of the temperature dependences of forward and reverse I-V characteristics, the dynamics of change of energy parameters was established and the role of energy states at the boundary of the heterojunction in the formation of the contact potential difference was clarified. The approximation of I-V characteristics was carried out within the framework of the model, which takes into account the influence of series and shunt resistances. The values of the diode coefficient, series and shunt resistances of the heterojunction were found. The mechanisms of formation of direct and reverse currents through the CuFeO2/n-InSe energy barrier were determined. The spectral dependence of the quantum efficiency of heterojunctions in the range of photon energies from 1.2 to 3.2 eV was studied. The effect of light absorption in heterostructure materials on its general photosensitivity was analyzed. The obtained results confirmed the promise of CuFeO2/n-InSe heterojunctions for photoelectronics.

Country
Ukraine
Keywords

селенід індію, електропровідність, CuFeO2, electrical conductivity, фоточутливість, indium selenide, photosensitivity

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green