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Photovoltaic properties of organic heterojunctions formed from tetracene and zinc hexadecafluorophthalocyanine

100%

Signerski R.

tom Vol. 27, No. 3

763--768

Experimental results obtained for the systems with a planar heterojunction of tetracene (Tc)/zinc perfluorophthalocyanine (F16ZnPc) are presented in this work. The systems were prepared by vacuum evaporation of the following materials: MoO3, Tc, F16ZnPc, bathocuproine (BCP) and Ag, onto glass/ITO substrates. Dark current-voltage and photocurrent-voltage relationships as well as spectral and light intensity dependences of short-circuit current are presented. The favourable effect of a buffer layer of BCP at the Ag electrode was observed.

Stabilization energies in charged tetracene clusters Quantum chemical and microelectrostatic calculations

100%

Eilmes A.

tom Vol. 27, No. 3

629--635

Theoretical calculations of the stabilization energy for an excess electron in tetracene clusters are presented. Vertical detachment energies were calculated for small clusters (up to 7 tetracene molecules) using the quantum-chemical DFT method. For larger clusters and an infinite 2D layer of tetracene molecules, the self-consistent polarization field (SCPF) method was used to calculate the polarization energy for a tetracene anion. Both DFT and SCPF results show that the charge stabilization energy increases rapidly with the cluster size and, even for clusters of less than 10 tetracene molecules, amounts to more than 50% of the bulk crystal value, which is in agreement with the conclusions of a recent experimental work.

Observation of electron injection in an organic field-effect transistor with electroluminescence

100%

Ohshima Y. , Kohn H. , Lim E. , Manaka T. , Iwamoto M.

tom Vol. 27, No. 3

719--726

A tetracene field-effect transistor (FET) with Au source and drain electrodes showed p-channel type behaviour, where the injected holes were the main carriers. Application of an ac electric field to the source electrode, while drain and gate electrodes were grounded, induced electroluminescence (EL) around the source electrode that was caused by alternating electron and hole injection. This result indicated that electron injection into tetracene was possible from a metal with a high work function such as Au. The application of an ac voltage superposed on a dc voltage showed that electron injection was assisted by the space-charge field that originated from holes accumulated around the source electrode.

Photoelectric properties of WO3/tetracene heterojunctions

100%

Signerski R. , Jarosz G.

tom Vol. 27, No. 3

757--762

Photoelectric properties of ITO/tetracene (Tc)/Ag and ITO/WO3/Tc/Ag sandwich systems have been reported. The system containing the WO3/Tc heterojunction exhibits a higher current rectification in the dark and a stronger photovoltaic effect. Values of the open-circuit voltage exceeding 800 mV have been observed. The obtained results can be elucidated on the assumption that a downward band bending or an interface dipole at the WO3/Tc heterojunction occurs.

Polskie wynalazki z technologii inicjujących materiałów wybuchowych stosowanych w amunicji wojskowej

51%

Miszczak M. , Rećko J.

Problemy Techniki Uzbrojenia

2023

tom R. 52, z. 165

7--22

W artykule przedstawiono rezultaty analiz dziewięciu opisów patentowych [1-9] polskich wynalazków z zakresu technologii wytwarzania azydku ołowiu, trinitrorezorcynianu ołowiu i tetrazenu - inicjujących materiałów wybuchowych powszechnie stosowanych w amunicji wojskowej. Pięć wynalazków [1,2,7-9] zostało zgłoszonych do polskiego Urzędu Patentowego w trybie jawnym w latach 1935-1975, zaś pozostałe cztery [3-6] zgłoszono jako niejawne w latach 1954-1962. O zdjęciu klauzuli tajności z wynalazków zgłoszonych jako niejawne ogłoszono w Wiadomościach Urzędu Patentowego RP w roku 2007.

Thepaper presents results of analyses of nine patent descriptions [1-9] of Polish inventions on manufacture technology of primary explosives as lead azide, lead trinitrore-sorcinate and tetracene, commonly used in military munitions. Five patent descriptions [1,2,7-9] were filed to the Polish Patent Office in years 1935-1975 as unclassified, and the rest patent descriptions [3-6] were applied as classified in years 1954-1962. Announcements about removing secrecy from the classified patent descriptions, were published in the News of the Polish Patent Office in year 2007.