Photovoltaic behavior of centimeter-long lateral organic junctions

Doping effects on organic lateral photovoltaic cells with separated carrier‐generating and doped carrier‐transporting layers are investigated. A doping concentration of 100 ppm into the lateral hole and electron transporting layers doubles the photocurrent density by forming a built‐in potential between the layers in the vertical direction of the lateral cell, which accelerates carrier generation. A higher doping concentration induces trap‐assisted recombination at direct C8‐BTBT/PTCDI‐C8 contact points and causes a decrease in photocurrent density.

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Doped Lateral Organic Photovoltaic Cells

Ithikkal

Izawa

Hiramoto

2023

Physica Status Solidi (a)

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Direct observation of the electronic structure and many-body interactions of low-mobility carriers in perylene diimide derivative

Palassery Ithikkal,

Fukutani,

Nishino

et al. 2024

Applied Physics Letters

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Despite the rapid progresses in the field of organic semiconductors, aided by the development of high-mobility organic materials, their high carrier mobilities are often unipolar, being sufficiently high only for either electrons or holes. Yet, the basic mechanisms underlying such significant mobility asymmetry largely remains elusive. We perform angle-resolved photoelectron spectroscopy to reveal the occupied band structures and the many-body interactions for low-mobility hole carriers in a typical n-type semiconductor perylene diimide derivative. The band dispersion exhibits strong renormalization to the calculated non-interacting electronic structure. The analysis including many-body interactions elucidate that the significant mass enhancement can be understood in terms of strong charge–phonon coupling, leading to an important mechanism of polaron band transport of low intrinsic carrier mobility in organic semiconductors.

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Lateral-tandem organic photovoltaic cells with carrier transport and generation layers

Ithikkal

Yabara

Uto

et al. 2021

Appl. Phys. Express

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We report the fabrication and operation of organic photovoltaic cells with lateral junctions and separated carrier-generating and carrier-transporting layers. Significant photocurrent increase was observed by inserting carrier generating layer having strong visible absorption. For the lateral tandem cells, an increase in the number of unit cells increased the photocurrent while keeping the photovoltage constant. It is easier to increase the number of unit cells in lateral tandem cells compared to conventional vertical tandem cells because the adjustment of photocurrent density flowing in each unit cell is no longer necessary.

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Photovoltaic behavior of centimeter-long lateral organic junctions

Cited by 3 publications

References 27 publications

Doped Lateral Organic Photovoltaic Cells

Doped Lateral Organic Photovoltaic Cells

Direct observation of the electronic structure and many-body interactions of low-mobility carriers in perylene diimide derivative

Lateral-tandem organic photovoltaic cells with carrier transport and generation layers

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