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Technical Brief

A Comparative Study on the Optimization of a Ternary P3HT:PCBM:Pentacene Active Layer in Bulk Heterojunction Organic Solar Cells

[+] Author and Article Information
Gerson dos Santos

Laboratório de Microeletrônica,
Departamento de Engenharia de Sistemas Eletrônicos,
Escola Politécnica da Universidade de São Paulo,
Avenida Prof. Luciano Gualberto,
Travessa 3, No. 380, Butantã,
São Paulo, SP CEP 05508-900, Brazil
e-mail: gsantos@lme.usp.br

Marco Roberto Cavallari

Laboratório de Microeletrônica,
Departamento de Engenharia de Sistemas Eletrônicos,
Escola Politécnica da Universidade de São Paulo,
Avenida Prof. Luciano Gualberto,
Travessa 3, No. 380, Butantã,
São Paulo, SP CEP 05508-900, Brazil
e-mail: rcavallari@lme.usp.br

Fernando Josepetti Fonseca

Laboratório de Microeletrônica,
Departamento de Engenharia de Sistemas Eletrônicos,
Escola Politécnica da Universidade de São Paulo,
Avenida Prof. Luciano Gualberto,
Travessa 3, No. 380, Butantã,
São Paulo, SP CEP 05508-900, Brazil
e-mail: fernando.fonseca@poli.usp.br

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received December 4, 2014; final manuscript received March 26, 2015; published online April 17, 2015. Editor: Robert F. Boehm.

J. Sol. Energy Eng 137(4), 044502 (Aug 01, 2015) (4 pages) Paper No: SOL-14-1364; doi: 10.1115/1.4030315 History: Received December 04, 2014; Revised March 26, 2015; Online April 17, 2015

This work shows a comparative and processing optimization study of the recent ternary bulk heterojunction (BHJ) of P3HT: PCBM:pentacene (1:0.9:0.1 wt. ratio) against the well-known active layer of poly(3-hexylthiophene) (P3HT) blended to phenyl C61 butyric acid methyl ester (PCBM) (1:1 wt. ratio). Initially, monochlorobenzene (MCB) was compared and later replaced by dichlorobenzene (DCB) as active layer solvent. The following optimization step related to thermal annealing effects on solar cell power conversion efficiency (PCE) and fill-factor (FF). Ternary junction slow drying at room temperature without a postproduction thermal treatment proved to be the most suitable to improve BHJ morphology at nanoscale. Finally, ternary composite mass concentration ranged from 20 to 60 mg/ml in DCB to achieve an efficiency near 3% at 40 mg/ml. An observed improvement of at least 15% in photovoltaic efficiency and a practically constant open-circuit voltage (i.e., just 1.2% variation) compared to the already-established P3HT:PCBM blend corroborates the role of pentacene in the active layer to balance mobility from both charge carrier types.

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Figures

Grahic Jump Location
Fig. 1

Output current density versus voltage characteristics of photovoltaic devices from binary (P3HT:PCBM) and ternary (P3HT:PCBM:pentacene) blends dissolved in MCB

Grahic Jump Location
Fig. 2

Output current density versus voltage characteristics of polymer photovoltaics device using a ternary (P3HT:PCBM:pentacene) composition deposited in 40 mg/ml solution

Grahic Jump Location
Fig. 3

Output current density versus voltage characteristics of polymer photovoltaics using a ternary (P3HT:PCBM:pentacene) composition for the active layer dissolved in DCB from 20 to 60 mg/ml and thermally annealed

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