Efficient hybrid polymer/TiO2 solar cells using a multilayer structure

Punniamoorthy Ravirajan; Alex Green; Saif A. Haque; James R. Durrant; Donal D.C. Bradley; Jenny Nelson

doi:10.1117/12.561212

3 November 2004 Efficient hybrid polymer/TiO₂ solar cells using a multilayer structure

Punniamoorthy Ravirajan, Alex Green, Saif A. Haque, James R. Durrant, Donal D.C. Bradley, Jenny Nelson

Proceedings Volume 5520, Organic Photovoltaics V; (2004) https://doi.org/10.1117/12.561212
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

This study focuses on systems consisting of high hole-mobility MEHPPV based polymers or a fluorene-bithiophene co-polymer in contact with different nanocrystalline TiO₂ films. We use photoluminescence quenching, time of flight mobility measurements and optical spectroscopy to characterize the exciton transport, charge transport and light harvesting properties, respectively, of the polymers, and correlate these material properties with photovoltaic device performance. We find that the polymer properties with greatest influence on device efficiency are the polymer exciton diffusion length and absorption range, followed by the hole mobility. We have also studied the photovoltaic performance of these TiO₂/polymer devices as a function of active layer thickness. Device performances are significantly improved by introducing a PEDOT layer between the polymer and the top Au electrode and by reducing the thickness of the active layers. The optimized devices have peak external quantum efficiencies ≈ 40 % at the polymer's maximum absorption wavelength and yield short circuit current densities ≥ 2 mA cm^-2 for air mass (AM) 1.5 conditions (100 mW cm^-2, 1 sun). The AM 1.5 open circuit voltage reaches 0.64 V and the fill factor 0.43, resulting in an overall power conversion efficiency of 0.58 %.

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Punniamoorthy Ravirajan, Alex Green, Saif A. Haque, James R. Durrant, Donal D.C. Bradley, and Jenny Nelson "Efficient hybrid polymer/TiO₂ solar cells using a multilayer structure", Proc. SPIE 5520, Organic Photovoltaics V, (3 November 2004); https://doi.org/10.1117/12.561212

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KEYWORDS

Polymers

Telescopic pixel displays

Excitons

Absorption

Diffusion

Electrodes

Luminescence

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