Tribute in honor of Prof. Ivo Alexander Hümmelgen, a member of the Brazilian materials research community, who died unexpectedly in March 2019. The tribute was made by Prof. Marco Cremona (PUC-Rio), on September 23, 2019 in Balneário Camboriú (Brazil), at the opening of symposium F, that was dedicated to Organic Electronics, the research area of ​​Prof. Hümmelgen.

1. Professor Ivo A. Hummelgen died suddenly
and unexpectedly on 01 March 2019, still 55
years old, 28 of them dedicated to UFPR.
Professor of the Department of Physics of
UFPR and researcher 1B of CNPq,
Hümmelgen was graduated Bachelor of
Physics from UFPR, Master from USP São
Carlos and PhD from the University of
Gottingen in Germany.
1
Tribute to a dear
colleague and friend
Ivo Alexander Hümmelgen
(26 March 1963 – 1 March 2019)

2. 2
1987 – 1991 PhD in Göttingen, Alemanha (Prof.
Wolfgang Schröter.)
1991 – post-doc at Göttingen, polycrystalline silicon
solar cells.
1992 march – Professor at UFPR
2014 – Full professor at UFPR until 2019
• Research in organic semiconductors, charge
transport, devices (OPV,OFET), material
characterization (GOOD = Group of Organic
Optoelectronic Devices)
• Coordinator of Nanotechnology/Energy area for
IBAS (India, Brazil, South Africa) initiative.
• Member of CNPq evaluation committee (CA),
CAPES postgraduate evaluation committee,
Araucaria Physics commission (among others).
• SBF secretary (2013 – 2017).
• Coordinator of research at UFPR, postgraduate
coordinator of Physics Department at UFPR.
Professional
career

3. Ivo’s
lifestyle
3
“I created the deep conviction that
unquestionably very competent people
are very humble”.
“...isso me deixa profundamente irritado“
(...it makes me deeply annoyed)
Considerations about the electrochemical estimation
of the ionization potential of conducting polymers.
L. Micaroni, F. Nart, I. Hümmelgen, Journal of Solid
State Electrochemistry 7, 1 (2002) 55.

4. 4
The shock of his death is a hard reminder
of mortality but also brings out the
lesson of well lived life: that to leave this
place a bit better than you found it is
perhaps the greatest epitaph.