Elena Mironova Farhi-Vateva





Birth date and
place of birth:

September 9, 1930
Smjadovo, Bulgaria

Home Address:


Official Address:



Kompl. "Mladost 1", bl. 3, vhod 1, ap. 9; 1784 Sofia, Bulgaria
Phone: (+359) (2) 8745 180; e-mail: e_farhi@hotmail.com

Institute of Solid State Physics "Georgi Nadjakov", Bulgarian Academy of Sciences,
72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria

Phone: (+359) (2) 9795000 226 or  (+359)(2) 9795000 451; FAX:   (+359) (2) 9753632


Faculty of Physics, Sofia University "St. Kl. Ohridsky"
- MS 1956; 
"G. Nadjakov" Institute of Solid State Physics, Sofia
- Habilitation as Assoc. Prof. 1974, 
 Habilitation work "Double Injection in II-IV Compounds"
- Dr. Sci. in Phys. 1990,
 Dr. Sci. Thesis: "Photoinduced Phenomena in Chalcogenides"

Position in the Institute
of Solid State Physics:


Full Professor since 1992; 
Retired 1999, Assoc. Member of the Institute since 1999;

HONORARY Member of the Institute of Solid State Physics since 2005;


Ø      Laboratory leader 1968-1973 in Department of Prof. S. Kanev;
Research group leader 1973-1989 "Photoelectrical and Optical Phenomena in Wide Gap Semiconductors" in Department of J. Kassabov;
Head of Department (Laboratory "Photoelectrical and Opti­cal Phenomena in Wide Gap Semiconductors") 1989-1999.


Ø      Scientific supervisor of Ph.D. Thesis of 6 students and scientists, of Diploma works of 21 students and of a Post-Master of Science Fellow

Profess. Awards:

Bulgarian Academy insignia 1973
Honory sign for merit to Bulgarian Academy of Sciences 1999

Honory sign of the Institute of Solid State Physics "G. Nadjakov", with ribbon, 2002


Member of the Science Council of the Institute 1974-1999
Member of the Bulgarian Scientific Union
Member of the Bulgarian Physical Union
Member of the New York Academy of Sciences, only 1994
Member of the Coordination Commission for Amorphous Semiconductors by the Collaboration Committee of East countries till 1990
Member of Conference Organizing or Program Committee (Varna 1971, 1974, 1977; Primorsko 1977, Pardubice 1978, Kishinev 1980, Varna 1980, Bucharest 1982, Varna 1983,  Balatonszeplak 1986, Uzhgorod 1989, 1998)

Chairman of International Organizing Committee of the Conference "Amorphous Semiconductors, Gabrovo' 84

Member of the International Group of Chalcogeniders

Member of the International jury for Owshinsky Award 2001-2004

Publications and Books:

140 scientific publications, 8 patents (Bulg. Authorships)  
Co-editor of Conference Proceedings in 2 volumes


97 papers are presented on Conferences, Schools, Workshops in 
Bulgaria(58), Romania (9), Ukraina (7), Moldova (4), Hungary (4), Germany (3), Czechia (3), Russia (2), Litva (2), Italy (2), USA (1), Great Britain (1), Turkey (1).
9 Invited plenary lectures are given in
Guyulechitsa (1975), Primorsko (1977), Vilnius (1983), Gabrovo (1984), Balatonsceplak (1986), Varna (1988), Uzhgorod (1989), Kishinev (1990, 1996).
Invited lectures on Institute Seminars are given in Kiev (1962, 1964), Berlin (1965, 1967), 
Kiev (1970, 1979), Magdeburg (1984, 1985), Vilnius (1985), Athens (1994).


19 Research projects were directed in the Insitute (3 of them with the National Science Fund);

10 International projects were directed with Academies of the Eastern countries;
10 International projects were directed with Institutes in USSR (Kiev; Leningrad-Kishinev- Vilnius), Romania (Bucharest), Moldova (Kishinev), Russia (St. Petersburg), Ukraina (Kiev, Lvov) and Greece (Athens).


Field of research interests:







Main results:

Crystalline and amorphous semiconductors, thin films, multilayers and amorphous superlattices of chalcogenides, photoelectrical, electrical and optical phenomena, structure and photostructural changes, transport and recombination processes, defect states,  electrophotographic and photolithographic properties and low-temperature thermal properties of chalcogenides.


In the field of the photoeffects in chalcogenides the photo­induced phenomena in crystalline and amorphous chalcogenides are developed. Investigations of nano­structures are initiated and the new field of the amorphous multilayers and superlattices from chalcogenides are developed. 







1. E.Vateva, “On Negative Resistance in CdS”, Compt.Rend.Acad.Bulg.Sci. 18, 105-108 (1965)

2. E.Vateva, Positive and Negative Infrared Photoconductivity of CdS Single Crystals near the Double Injection Threshold”, Phys.Stat.Sol. 34, 591-595 (1969)

3. Å. Vateva, I. Georgieva, On the photochemical sensitizing and ageing in CdS monocrystals” (in Russian), Ôèçèêà è òåõíèêà ïîëóïðîâîäíèêîâ, 8, 566-570 (1974)

4. E.Vateva, D.Nesheva, “Photoconductivity of amorphous CdS films”, J.Non-Cryst.Sol., 51, 381-388, 1982.

5. B.Pashmakov, E.Vateva, À.Bekirov, Electrophotographic multi-layer plates based on vacuum evaporated CdS and polyethylene”, Appl.Phys.A, 37, 243-246 (1985).

6. D.Nesheva, E.Vateva, N.Korsunskaya, I.Markevich, “Influence of annealing on photoinduced phenomena in CdS, J. Phys. D: Appl. Phys., 18, 677-683 (1985).

7. E.Vateva, D.Nesheva, “Photoinduced phenomena in chalcogenide structures”, J.Non-Cryst.Sol., 90, 497-504 (1987).

8. E.Vateva, I.Georgieva, “Amorphous Se/Se-Te multilayers, J.Non-Cryst. Sol., 114, 124-126 (1989).

9. E. Vateva, I. Georgieva, “Optically-induced stepwise absorption in Se/Se85Te15 Multilayers, J. Non-Cryst. Sol. 164-166, 865-868 (1993).

10. E.Vateva, D.Nesheva, “Small-Angle X-ray Diffraction Studies on Interface Sharpness of Amorphous Se/CdSe Superlattices”, J.Non-Cryst.Sol., 191, 205-208 (1995).

11. M. Popescu, F. Sava, A. Lorinczi, E. Vateva, D. Nesheva, P.-J. Koch, T. Gutberlet, W. Uebach, H. Bradaczek, “Thermal stability of amorphous Se/CdSe multilayers, Sol. State Comm. 103, 431-434 (1997).

12. E. Vateva, Amorphous superlattices of chalcogenides”, NATO ASI Series, 3, High Techn. V.36: "Physics and Applications of Non-Crystalline Semiconductors in Optoelectronics", eds. M. Bertolotti a. A. Andriesh, Kluwer Acad. Publ., The Netherlands, p.61-75, 1997.

13. D. Nesheva, I.P. Kotsalas, C. Raptis, E. Vateva, On the structural stability of amorphous Se/CdSe multilayers: a Raman study”, J. Non-Cryst. Solids 224, 283-290 (1998).

14. E. Vateva, G. Tschaushev, “Laser ablated amorphous multilayers, J. Optoelectron..Adv. Mater., 1, 9-14 (1999).

15. E. Vateva, M. Nikiforova, E. Skordeva, Ge-As-S Selective Solubility”, J. Non-Cryst. Sol., 77-78 (1985) 1133-1136.

16. D.Minkov, E.Vateva, E.Skordeva, D.Arsova, M.Nikiforova, “Optical properties of Ge-As-S thin films”, J. Non-Cryst. Sol. 90, 481-484 (1987).

17. E. Vateva, E. Skordeva, D. Arsova, “Average Coordination Number Dependence of Photostructural Changes in Amorphous Ge-As-S Films”, Phil. Mag. B, 67 (1993) 225-235.

18. E. Vateva, D. Arsova, E. Skordeva, E. Savova, “Physical and Physicochemical Evidences for Topological Phase Transition in Amorphous Chalcogenide Films”, Proc. 11th ISCMP Varna'94, Electronic Materials,Series,Eds J.Marshall,N.Kirov,A.Vavrek, RSP LTD,1995,England,p.604-611.

19. E. Vateva, E. Savova, “New medium range order features in Ge-Sb-S glasses”, J. Non-Cryst. Sol., 192-193, 145-148 (1995).

20. T. Velinov, M. Gateshki, D. Arsova, E. Vateva, Thermal diffusivity of Ge-As-Se(S) glasses”, Phys. Rev. B(R) 55, 11014-11017 (1997).

21.  E. Vateva, E.Skordeva, Nanoscale arrangement in GexAs(Sb)40-xS60 systems”, J.Optoel.Adv.Mat. 4 (2002) 3-11.

22. E. Vateva, D. Arsova, E. Skordeva, V. Pamukchieva, “Irreversible and Reversible Changes in Bandgap and Volume of Chalcogenide Films”, J. Non-Cryst. Solids 326-327 (2003) 243-247.

23. Y.C. Boulmetis, A. Perakis, C. Raptis, D. Arsova, E. Vateva, D. Nesheva, E. Skordeva, “Composition and temperature dependence of the low-frequency Raman scattering in Ge-As-S glasses”, J. Non-Cryst. Solids, 147, 187-196 (2004).

24. B. Terziyska, A. Czopnic, E. Vateva, D. Arsova, R. Czopnik, “Low-temperature specific heat of Ge-As-S glasses”, Phil. Mag. Letters, 85, 145-150 (2005).

25. B. Terziyska, H. Misiorek, E. Vateva, A. Jezowski, D. Arsova, “Low-temperature thermal conductivity of GexAs40-xS60 glasses”, Solid State Comm., 134, 349-353 (2005).

26. E. Vateva, B. Terziyska, H. Misiorek, A. Jezovski, D. Wlosewics, D. Arsova, “Low-temperature thermal properties of Ge-As-S glasses”, J. Optoelectron..Adv. Mater., 7, 357-360 (2005)

27. F. Yakophanoglu, D. Arsova, E. Vateva, Photoinduced Changes of Optical Parameters of Thin Films from Ge30.8As63.5S63.5  glass, J. Optoelectron..Adv. Mater. 8 (2007)




Last update January 2007