Jun
HARADA
Associate
Professor
Address
Department of Chemistry, Faculty of Science
Hokkaido
University
Kita 10, Nishi 8, Kita-ku,
Sapporo, Hokkaido
060-0810
Japan
E–mail: junharada[at]sci.hokudai.ac.jp
Education
1992: B.S., Faculty of Science, The University of
Tokyo
1994: M.S., Graduate School of Science, The University
of Tokyo
1997: Ph.D., Graduate School of Science, The
University of Tokyo
Professional Positions
1997–1999: Postdoctoral fellow at Tokyo Institute of
Technology (Prof. Yuji Ohashi)
1999–2012: Assistant professor at Graduate School of
Arts and Sciences, The University of Tokyo (Prof. Keiichiro Ogawa)
2012–present: Associate professor at Faculty of
Science, Hokkaido University.
Research Keywords
Ferroelectric Molecular Crystals; Plastic Crystals;
Molecular Motions in Crystals; X-ray Crystallography
Publications
[2023]
Y. Uemura, S. Matsuoka, S.
Arai, J. Harada, and T. Hasegawa “Intersecting
multiaxial domain walls in plastic ferroelectric crystal films” Phys.
Rev. Mater., 7,
035601 (2023).
J. Harada, H. Takahashi, R. Notsuka, M. Takehisa,
Y. Takahashi, T. Usui, and H. Taniguchi “Ferroelectric
Ionic Molecular Crystals with Significant Plasticity and a Low Melting Point:
High Performance in Hot-Pressed Polycrystalline Plates and Melt-Grown
Crystalline Sheets” Angew. Chem. Int. Ed., 62, e202215286
(2023).
[2022]
J.
Harada, M. Takehisa, Y. Kawamura, H. Takahashi, and Y. Takahashi “Plastic/Ferroelectric
Crystals with Distorted Molecular Arrangement: Ferroelectricity in Bulk
Polycrystalline Films through Lattice Reorientation” Adv. Electron.
Mater., 8, 2101415 (2022).
[2021]
S. Yokokura, A. Tomimatsu, J. Ishiguro, J. Harada, H. Takahashi, Y.
Takahashi, Y. Nakamura, H. Kishida, R. Suizu, M. M.
Matsushita, and K. Awaga “Stabilization of
Interfacial Polarization and Induction of Polarization Hysteresis in Organic
MISIM Devices” ACS Appl. Mater. Interfaces, 13, 31928–31933
(2021).
Y. Takahashi, K. Ishida, S. Matsuno,
M. Kurokawa, T. Shimada, J. Harada, and T. Inabe “Charge
injection phenomena at the contact interface between
5,10,15,20-tetra(methyl)porphyrin cobalt and
2,5-difluoro-7,7,8,8-tetracyanoquinodimethane single crystals” CrystEngComm, 23, 3975–3980 (2021).
J. Harada “Plastic/ferroelectric
molecular crystals: Ferroelectric performance in bulk polycrystalline forms”
APL Mater., 9, 020901 (2021).
[2020]
Y. Takahashi, T. Kondo, S. Yokokura,
M. Takehisa, J. Harada, T. Inabe, M. M. Matsushita,
and K. Awaga “Electric and
Thermosalient Properties of a Charge-Transfer Complex Exhibiting a Minor
Valence Instability Transition” Cryst.
Growth Des., 20, 4758–4763 (2020).
Y. Takahashi, M. Takehisa, E. Tanaka, J. Harada, R.
Kumai, and T. Inabe “Incorporating
Spacer Molecules into the Tetrathiafulvalene-p-Chloranil Charge-Transfer
Framework: Modulating the Neutral–Ionic Phase Transition” J. Phys. Chem.
Lett., 11, 1336–1342 (2020).
M. Yoneya and J. Harada “Molecular Dynamics
Simulation Study of the Plastic/Ferroelectric Crystal Quinuclidinium Perrhenate”
J. Phys. Chem. C, 124, 2171–2177 (2020).
[2019]
J.
Harada, Y. Kawamura, Y. Takahashi, Y. Uemura, T. Hasegawa,
H. Taniguchi, and K. Maruyama “Plastic/Ferroelectric
Crystals with Easily Switchable Polarization: Low-Voltage Operation,
Unprecedentedly High Pyroelectric Performance, and Large Piezoelectric Effect
in Polycrystalline Forms” J. Am. Chem. Soc., 141, 9349-9357
(2019).
J.
Harada, N. Yoneyama, S. Sato, Y. Takahashi, and T. Inabe “Crystals of
Charge-Transfer Complexes with Reorienting Polar Molecules: Dielectric
Properties and Order–Disorder Phase Transitions” Cryst.
Growth Des., 19, 291-299 (2019).
[2018]
K. Kobayashi, H. Hasegawa, Y. Takahashi, J. Harada,
and T. Inabe “Electronic
Properties of Tin Iodide Hybrid Perovskites: Effect of Indium Doping” Mater.
Chem. Front., 2, 1291–1295 (2018).
T. Shimada, Y. Takahashi, J. Harada, H. Hasegawa, and
T. Inabe “Band-Like Carrier
Transport at the Single-Crystal Contact Interfaces Between
2,5-Difluoro-7,7,8,8-Tetracyanoquinodimethane and Electron Donors” J.
Phys. Chem. Lett., 9, 420-424 (2018).
J.
Harada, N. Yoneyama, S. Yokokura,
Y. Takahashi, A. Miura, N. Kitamura, and T. Inabe “Ferroelectricity and
Piezoelectricity in Free-Standing Polycrystalline Films of Plastic Crystals”
J. Am. Chem. Soc., 140, 346-354 (2018).
[2017]
J.
Harada, M. Taira, and K. Ogawa “Photochromism of
Fulgide Crystals: From Lattice-Controlled Product Accumulation to Phase Separation” Cryst. Growth Des., 17, 2682–2687
(2017).
H.
Hasegawa, K. Kobayashi, Y. Takahashi, J. Harada, and T. Inabe
“Effective band gap tuning by foreign metal
doping in hybrid tin iodide perovskites”
J. Mater. Chem. C, 5,
4048–4052 (2017).
M. Kurokawa, J. F. F. Jose-Larong, H. Hasegawa, Y. Takahashi, J. Harada, and T. Inabe “Structural
and transport properties of neutral radical crystals of CoIII(tmp)(CN)2
(tmp = 5,10,15,20-tetramethylporphyrinato) and the CN-bridged polymer [CoIII(tmp)(CN)]n”
Dalton Trans., 46, 4422–4429 (2017).
[2016]
Y. Takahashi, T.
Mikasa, K. Hayakawa, S. Yokokura, H. Hasegawa, J.
Harada and T. Inabe “Fabrication of Conducting Thin Films on the Surfaces of
7,7,8,8-Tetracyanoquinodimethane Single-Component and Charge-Transfer Complex
Single Crystals: Nucleation, Crystal Growth, Morphology, and Charge Transport” J. Phys. Chem. C,
120, 17537–17545
(2016).
J. Harada, T. Shimojo, H. Oyamaguchi, H.
Hasegawa, Y. Takahashi, K. Satomi, Y. Suzuki, J. Kawamata,
and T. Inabe “Directionally tunable and mechanically deformable ferroelectric
crystals from rotating polar globular ionic molecules” Nature Chem.,
8, 946–952
(2016).
H. Kubota,
Y. Takahashi, H. Hasegawa, T. Shimada, Jun Harada, and T. Inabe
“Charge Carrier Doping into the Peierls Insulator of
the TCNQ Anion Radical Salt (TCNQ = 7,7,8,8-Tetracyanoquinodimethane)” J.
Phys. Chem. C, 120, 11545–11551
(2016).
[2015]
S. Yokokura, Y. Takahashi, H. Nonaka, H. Hasegawa, J. Harada,
T. Inabe, R. Kumai, H. Okamoto, M. M. Matsushita, and
K. Awaga “Switching of Transfer Characteristics of an Organic Field-Effect
Transistor by Phase Transitions: Sensitive Response to Molecular Dynamics and
Charge Fluctuation”
Chem. Mater., 27, 4441–4449 (2015).
J. Harada,
M. Ohtani, Y. Takahashi, and T. Inabe
“Molecular Motion, Dielectric Response, and Phase
Transition of Charge-Transfer Crystals: Acquired Dynamic and Dielectric
Properties of Polar Molecules in Crystals” J. Am. Chem.
Soc., 137, 4477–4486 (2015).
T. Mikasa,
Y. Takahashi, K. Hayakawa, S. Yokokura, H. Hasegawa,
J. Harada, and T. Inabe “Highly
ordered alignment of conducting nano-crystallites on organic semiconductor
single crystal surfaces” Thin Solid Films, 579, 38–43 (2015).
[2014]
H. Kubota, Y. Takahashi, J. Harada, and T. Inabe
“Structural and Physical Properties of a Series of
7,7,8,8-Tetracyanoquinodimethane Salts with Dications Bearing Two Terminal
Pyridinium Rings” Cryst. Groth Des., 14, 5575–5584 (2014).
Y. Takita, H. Hasegawa, Y.
Takahashi, J. Harada, A. Kanda, N. Hanasaki, and T. Inabe
“One-dimensional phthalocyanine-based conductor with S
= 3/2 isotropic magnetic centers” J.
Porphyrins Phthalocyanines, 18,
814–823 (2014).
J. Harada, and K. Ogawa “What Molecules Are Likely or Unlikely To Undergo Pedal Motions in Crystals?” Cryst. Groth Des., 14, 5182–5188 (2014).
G. S.
Lorena, H. Hasegawa, Y. Takahashi, J. Harada, and T. Inabe
“Hole Doping of Tin Bromide and Lead Bromide
Organic-Inorganic Hybrid Semiconductors” Chem. Lett.,
43, 1535–1537 (2014).
H. Kamebuchi, M. Okubo, A. Okazawa,
M. Enomoto, J. Harada, K. Ogawa, G. Maruta, S. Takeda, N. Kojima, C. Train, and M. Verdaguerg “A
tricky water molecule coordinated to a verdazyl radical–iron(II) complex: a
multitechnique approach” Phys. Chem. Chem. Phys., 16, 9086–9095 (2014).
Y.
Takahashi, K. Hayakawa, K. Takayama, S. Yokokura, J.
Harada, H. Hasegawa, and T. Inabe “Charge Conduction Properties at the Contact Interface
between (Phthalocyaninato)nickel(II) and Electron Acceptor Single Crystals” Chem.
Mater., 26, 993–998 (2014).
[2013]
Y. Seki, A. Okazawa, M. Enomoto, J. Harada,
K. Ogawa, and N. Kojima “Alternating Ferro- and Antiferromagnetic Couplings in
One-Dimensional Chain Hexachlorodicuprate(II), (MV)[CuCl3]2 (MV = Methyl
Viologen)” Curr. Inorg. Chem.,
3, 94–100 (2013).
Y. Nakagawa,
Y. Takahashi, J. Harada, and T. Inabe “The bis(ethylenedithio)tetrathiafulvalene-based ionic
charge-transfer complex with 2,3-dichloro-5,6-dicyano-p-benzoquinone” Acta
Crystallogr., Sect. C, 69, 400–402 (2013).
[Until 2012, selected]
J. Harada,
K. Ueki, M. Anada, Y. Kawazoe, and K. Ogawa “Solid-State Photochromism of Chromenes: Enhanced
Photocoloration and Observation of Unstable Colored Species at Low Temperatures” Chem.
Eur. J., 17, 14111–14119 (2011).
J. Harada,
Y. Kawazoe, and K. Ogawa “Photochromism
of spiropyrans and spirooxazines in the solid state: low temperature enhances
photocoloration” Chem. Commun.,
46, 2593–2595 (2010).
J. Harada
and K. Ogawa “Pedal
motion in crystals”
Chem. Soc. Rev., 38, 2244–2252 (2009).
原田 潤, 小川 桂一郎, 「有機結晶の色変化を理解する-サリチリデンアニリン類のサーモクロミズムの真相-」現代化学, 2009年，1月号，25–30.
J. Harada,
R. Nakajima, and K. Ogawa “X-ray
Diffraction Analysis of Photochromic Reaction of Fulgides: Crystalline State
Reaction Induced by Two-Photon Excitation” J. Am. Chem.
Soc., 130, 7085–7091 (2008).
J. Harada, T.
Fujiwara, and K. Ogawa “Crucial
Role of Fluorescence in the Solid-State Thermochromism of Salicylideneanilines” J.
Am. Chem. Soc., 129, 16216–16221
(2007).
T. Fujiwara,
J. Harada, and K. Ogawa “Solid-State
Thermochromism Studied by Variable-Temperature Diffuse Reflectance
Spectroscopy. A New Perspective on the Chromism of Salicylideneanilines” J.
Phys. Chem. B, 108, 4035–4038
(2004).
J. Harada
and K. Ogawa “X-ray
Diffraction Analysis of Nonequilibrium States in Crystals: Observation of an
Unstable Conformer in Flash-Cooled Crystals” J. Am. Chem.
Soc., 126, 3539–3544 (2004).
J. Harada,
and K. Ogawa “Invisible
but Common Motion in Organic Crystals: A Pedal Motion in Stilbenes and
Azobenzenes” J. Am. Chem. Soc., 123, 10884–10888 (2001).
J. Harada,
H. Uekusa, and Y. Ohashi X-ray
Analysis of Structural Changes in Photochromic Salicylideneaniline Crystals.
Solid-State Reaction Induced by Two-Photon Excitation” J.
Am. Chem. Soc., 121, 5809–5810
(1999).
K. Ogawa, Y.
Kasahara, Y. Ohtani, and J. Harada “Crystal Structure Change for the Thermochromy of
N-Salicylideneanilines. The First Observation by X-ray Diffraction” J.
Am. Chem. Soc., 120, 7107–7108
(1998).
J. Harada,
K. Ogawa, and S. Tomoda “Molecular
Motion and Conformational Interconversion of Azobenzenes in Crystals as Studied
by X-ray Diffraction”
Acta Crystallogr.,
Sect. B, 53, 662–672 (1997).
J. Harada,
K. Ogawa, and S. Tomoda “The
Central Bond Length in 1,2-Diphenylethanes” J. Am. Chem.
Soc., 117, 4476–4478 (1995).