Detail of "19631-19-7"

Reference

Sensitization of n-type semiconductors by phthalocyanines

Sensitization of n-type semiconductors by phthalocyanines. Loutfy, Rafik O.; Hor, Ah Mee (Xerox Res. Cent. Canada, Mississauga, ON L5L 1J9, Can.). Photochem. Photobiol., Proc. Int. Conf., Volume 2, 759-73. Edited by: Zewail, Ahmed H. Harwood: Chur, Egypt. (English) 1983. CODEN: 53AVAD. DOCUMENT TYPE: Conference CA Section: 52 (Electrochemical, Radiational, and Thermal Energy Technology) Section cross-reference(s): 74, 76 Photosensitization of n-type ZnO, CdS and CdSSe by a series of di- and trivalent metallophthalocyanines (MPc)e was studied in photovoltaic cells. The heterojunction photovoltaic devices were fabricated by 1st depositing a thin film of the n-type semiconductor on a transparent conducting In-Sn oxide substrate followed by a sequential vacuum deposition of the phthalocyanine and Au layers. Among the 7 divalent phthalocyanines, ZnPc [14320-04-8] and MgPc [1661-03-6] exhibited the highest photovoltaic activity. The trivalent phthalocyanines ClAlPc [14154-42-8], ClAlClPc [53199-37-4], and ClInPc [19631-19-7] exhibited even higher photoactivity. Under air-mass-2 illumination of 75 mW/cm2 the power conversion efficiencies of CdS/ClAlPc and CdS/MgPc n-p-heterojunction solar cells were 0.22 and 0.13%, resp. Those phthalocyanines which lead to high sensitization efficiency share the ability to form aggregates (dimers) in the solid state which leads to a broad and red-shifted absorption from that of the monomer form.

Hole mobilities in trivalent metal phthalocyanine thin films

Hole mobilities in trivalent metal phthalocyanine thin films. 2. Anomalous mobility temperature dependence in the low-temperature region 213-93 K for chloroaluminum, chlorogallium, and chloroindium phthalocyanine thin films. Ioannidis, A.; Dodelet, J. P. (INRS-Energie et Materiaux, Varennes, QC J3X 1S2, Can.). Journal of Physical Chemistry B, 101(6), 901-907 (English) 1997 American Chemical Society. CODEN: JPCBFK. ISSN: 1089-5647. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) In the first paper of the titled two-part study, the temp. and field dependencies of hole mobility in an upper temp. range of Tm = 333-213 K for ClAlPc thin films were detd. as a function of structural organization using the time-of-flight technique. The present paper reports the results of mobility measurements on extending the measurement temp. range down to ~90 K in chloroaluminum (ClAlPc), chlorogallium (ClGaPc), and chloroindium phthalocyanine (ClInPc) thin films vacuum-sublimed on substrates maintained at either Ts = 23 or 90°C. The mobility behavior undergoes an exceptional reversal in temp. dependence at low temps., beginning to rise on further cooling below ~200 K. The reversal is systematically studied, with mobility measurements as a function of temp. (Tm = 295-93 K) and of field (E = 134-302 kV/cm) at all temps. and is shown to be widely reproducible. Mobilities at 93 K equaled or surpassed their values at room temp., with indicative high-field (E = 222 kV/cm) values of 7.9 ′ 10-5, 7.4 ′ 10-5, and 7.25 ′ 10-5 V/cm2 for ClAlPc, ClGaPc, and ClInPc, resp. The effect is reversible, with a hysteresis of several hours. The photocurrent transients themselves undergo a reversal in trends assocd. with temp., their temporal profiles becoming comparable in the low-temp. region 193-93 K with those obsd. 19631-19-7 and 14154-42-8 are cas registry numbers of chemicals which are used as reagents here. at the higher temps. A color change with temp. is correlated to the mobility reversal. High-energy broadening in the absorbance spectra for all films combines with the mobility reversal to indicate a structural reorganization on lowering temps. that causes greater overlap of the phthalocyanine macrocycles. Trends in mobility dependencies are shown to be consistent with the proposed increase in MO interactions. The temp.-induced nature of the reorganization is seen to preclude rigorous treatment of the mobility dependencies in the low-temp. range according to the math. formalism of disorder due to Baessler and co-workers. Qual., however, the behavior of holes in ClAlPc-type materials remains explainable in terms of activated charge transport in the entire temp. range. Reversal of the mobility temp. dependence is not obsd. at low temp. for copper phthalocyanine. .