The effects of temperature on the molecular orientation of zinc phthalocyanine films

Gaffo, Luciana; Cordeiro, Márcia Regina; Freitas, Adonilson R.; Moreira, W. C.; Girotto, Emerson M.; Zucolotto, Valtencir

doi:10.1007/s10853-009-4094-3

Cited by 75 publications

(67 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The oven with the samples was heated from 25 °C to the required temperature at a rate of ~ 20 °C min -1 ; this temperature was kept constant for 3 h. Various annealing temperatures were used to examine the influence of heating temperature on the PDADMAC/CuPcTs multilayers and to achieve an α→β phase transition [66][67][68][69][70].…”

Section: Thermal Treatmentmentioning

confidence: 99%

“…The central metal atom and substituents on the benzene rings of the phthalocyanine molecule influenced UV-vis absorbance; CuPcTs had strong absorption bands around 650 nm (Q bands) [63][64][65][66][67][70][71][72][73]. The characteristic maxima of CuPcTs were in the 300-800 nm range of the absorbance spectra, which was convenient for the analysis of the semitransparent thin PEI/CuPcTs/(PDADMAC/CuPcTs) n films.…”

Section: Film Fabricationmentioning

confidence: 99%

“…The influence of annealing on evaporated pure phthalocyanine films has been studied [66][67][68][69][70]. For 30-150-nm-thick coatings prepared by vacuum evaporation, a phase transition was achieved if the temperatures from 240-250 °C [68,69] to 300 °C [66] were used.…”

mentioning

confidence: 99%

“…The minimum known phase transition temperature is 200 °C for 80-nm-thick vacuumevaporated ZnPc films [70]. The phase transition point for phthalocyanine-polyelectrolyte multilayer films may differ from that for pure phthalocyanine owing to the presence of the polyelectrolyte matrix, which can lead to phase separation [27,[29][30][31][32][33] and affect phthalocyanine thermostability [47].…”

mentioning

confidence: 99%

See 3 more Smart Citations

Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment

et al. 2015

View full text Add to dashboard Cite

Section: Thermal Treatmentmentioning

confidence: 99%

Section: Film Fabricationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment

et al. 2015

View full text Add to dashboard Cite

“…To realize the growth of the phase, ZnPc was deposited on substrates kept at room temperature [8]. A phase transition from -ZnPc to -ZnPc upon annealing has been demonstrated in the literature [7,9,10]. Here, the stable -ZnPc phase was obtained from the metastableZnPc samples via annealing under ambient conditions for 3 h at 240 ∘ C and above.…”

Section: Methodsmentioning

confidence: 99%

Optical Constants of α‐ and β‐Zinc(II)‐Phthalocyanine Films

Kozlik

Paulke

Gruenewald

et al. 2013

Dataset Papers in Science

View full text Add to dashboard Cite

We present a dataset of the optical constants of -and -zinc(II)-phthalocyanine (ZnPc). They were determined accurately from transmission and differential reflectance spectra, with the surface roughness taken into account. For this purpose, thin films were prepared on quartz glass substrates via physical vapor deposition and characterized by ultraviolet-visible (UV-Vis) spectroscopy before as well as after a well-defined annealing process. Kramers-Kronig consistency of the optical constants obtained was checked by means of a numerical algorithm.

show abstract

The Impact of Molecular Orientation on the Photovoltaic Properties of a Phthalocyanine/Fullerene Heterojunction

Rand

Cheyns

Vasseur

et al. 2012

Adv Funct Materials

305

312

View full text Add to dashboard Cite

The anisotropy inherent to many planar organic molecules leads to a high sensitivity of various fundamental processes to the orientation of molecules within fi lms and at heterojunctions. Such processes include absorption, charge and exciton transport, energy levels, and charge transfer, all of which are critical to organic solar cell operation. Here,an in-depth study of bilayer cells consisting of a donor/acceptor interface between zinc phthalocyanine (ZnPc) and fullerene (C 60 ) is conducted and devices with the typically deposited standing up (edge-on) orientation are compared to those with ZnPc lying fl at (face-on). The face-on ZnPc-based device allows for an increase in all solar cell parameters, substantially increasing power conversion effi ciency from 1.5% to 2.8%. Spectrally resolved photocurrent measurements reveal a > 50% increase in ZnPc signal, from which only 12% is accounted for by the increase in absorption associated with the face-on orientation. The increase in internal quantum effi ciency is accounted for via an improved charge transfer. The results of this study indicate that proper consideration of the orientation between donor and acceptor needs to be taken in order to fully optimize the numerous processes required for photovoltaic energy conversion.

show abstract

The effects of temperature on the molecular orientation of zinc phthalocyanine films

Cited by 75 publications

References 33 publications

Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment

Layer-by-layer assembled highly absorbing hundred-layer films containing a phthalocyanine dye: Fabrication and photosensibilization by thermal treatment

Optical Constants of α‐ and β‐Zinc(II)‐Phthalocyanine Films

The Impact of Molecular Orientation on the Photovoltaic Properties of a Phthalocyanine/Fullerene Heterojunction

Contact Info

Product

Resources

About