The study on organic solar cells based on bathocuproine as an exciton blocking layer

Feng Liu; Jian Zhong; Junsheng Yu; Yadong Jiang

doi:10.1117/12.866295

22 October 2010 The study on organic solar cells based on bathocuproine as an exciton blocking layer

Feng Liu, Jian Zhong, Junsheng Yu, Yadong Jiang

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76582Q (2010) https://doi.org/10.1117/12.866295
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Using a buffer layer between C₆₀ and cathode was an important and popular approach to improve the performance of organic photovoltaic cells. In this work, we chose CuPc (Copper(II) phthalocyanine) as an electron donor material, C₆₀ (fullerene) as an electron acceptor material and BCP (Bathocuproine) as an exciton blocking layer to fabricate an organic solar cells with a structure of ITO/CuPc/C₆₀/BCP/Ag, and studied the relationship between the photoelectric properties of organic solar cells and the film thickness of BCP. The results showed that the power conversion efficiency (PCE) was closely related to the thickness of exciton blocking layer. With the increasing of BCP film thickness, the power conversion efficiency of the device increased first and then decreased. When the thickness was 0 nm, the power conversion efficiency (PCE) was 0.357 %. When the film thickness was 25 nm, the PCE was 1.013 %. And when the thickness was 50 nm, the PCE was 0.43 %. However, when the thickness was 100 nm, the PCE was 0 %.We presumed that the exciton blocking layer reduce the quenching rate at the interface between organic layer and cathode so that exciton can be separated into electrons and holes more effectively. As a result, the PCE increased. At the same time, if the film of BCP layer thickness is too thick, PCE would sharply decrease due to high resistance during collecting charge carriers.

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Feng Liu, Jian Zhong, Junsheng Yu, and Yadong Jiang "The study on organic solar cells based on bathocuproine as an exciton blocking layer", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76582Q (22 October 2010); https://doi.org/10.1117/12.866295

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KEYWORDS

Excitons

Organic photovoltaics

Solar cells

Molecules

Heterojunctions

Interfaces

Polymers

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