Photovoltaic properties of cadmium sulfide/trivalent-metal phthalocyanine heterojunction devices

Abstract

Thin-film photovoltaic devices consisting of a CdS/trivalent-metal phthalocyanine heterojunction have been prepared. The devices are fabricated by first electrodepositing a thin film of CdS onto a transparent conducting indium-tin-oxide substrate and then depositing phthalocyanine and gold layers sequentially in a vacuum coater. The trivalent-metal phthalocyanines used are chloroaluminium chlorophthalocyanine (ClAlClPc), chloroaluminium phthalocyanine (ClAlPc), and chloroindium phthalocyanine (ClInPc). Under an AM2 illumination of 75 mW cm−2, these heterojunction devices produce an open-circuit voltage Voc of 0.70 V and short-circuit current Jsc of 0.8 mA cm−2. The conversion efficiency is about 0.2%, which represents one of the highest values reported for phthalocyanine photovoltaic devices at high light intensity.

CdS/chloroaluminum phthalocyanine heterojunctions: effect of CdS preparation method on the efficiency of photovoltaic cells

“…Under an A M 2 illumination of 7 5 m W ~m -~, conversion efficiencies of 0.22% were measured for the most performing Pcs: ClAlPc and ClAlClPc (7). Unlike the case of n-CdS/p-Cu2S, where the space charge region is situated in the CdS layer, it has been demonstrated that for a n heterojunction with a phthalocyanine (5,8), the space charge region is located exclusively in the organic semiconductor film.…”

“…Later on, following the example of inorganic cells like n-CdS/p-Cu2S, photovoltaic devices of the type n-CdS/p-PC were developed (5)(6)(7)(8)(9). Under an A M 2 illumination of 7 5 m W ~m -~, conversion efficiencies of 0.22% were measured for the most performing Pcs: ClAlPc and ClAlClPc (7).…”

“…In previous studies, the CdS electrode used with the Pcs was always prepared by cathodic electrodeposition of Cd2+ in the presence of sulfur in non-aqueous solution (5)(6)(7)(8)(9). The purpose of this work is to investigate other electrochemical techniques to prepare CdS.…”

A new form of hydroxyaluminum phthalocyanine by acid treatment. Characterization and photoactivity

“…The powder was heated in aqueous ammonia solution (30%) in the presence of pyridine for 12 h to give PcAlOH. The product was then washed by repeated solvent extraction techniques with acetone, ethanol, and chloroform (14).…”

Estudo químico-quântico ab initio e semi-empírico de compostos inorgânicos e orgânicos com possíveis aplicações tecnológicas

“…As ftalocianinas podem ser usadas como parte integrante da camada geradora de cargas e estão, normalmente, dispersas em uma faixa polimérica. Os tipos de ftalocianinas consideradas para este tipo de aplicação são: ftalocianinas base livre [13,14,15]; ftalocianinas de metais trivalentes, tais como a cloro-alumínio-ftalocianina (ClAlPc) [16] e cloro-índio-ftalocianina (ClInPc) [17,18]; as ftalocianinas dos metais tetravalentes tais como a vanidil ftalocianina (VOPc) [19] e titanil ftalocianina (TiOPc) [20].…”