Small-molecular organic solar cells with C60/Al composite anode

Wang, M.L.; Song, Qunliang; Wu, Haotian; Bao, Ding; Gao, Xiang; Sun, Xiaoyu; Ding, Xinyi; Hou, X. Y.

doi:10.1016/j.orgel.2007.03.001

Cited by 41 publications

(30 citation statements)

References 24 publications

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“…Also, Al deposited on C 60 can lead to similar charge transfer and interface dipole formation [28,29]. In recent years, C 60 /Al composite anode is widely used because of its high work function [20]. This issue is addressed in more detail in section 4.2.…”

Section: Field-induced Free Carrier Separationmentioning

confidence: 99%

“…Thus the experiments confirm that the interfacial buffer layer has another function of blocking permeation of oxygen and/or water molecules. In order to protect the C 60 layer, an inverted structure is proposed, which protects the C 60 layer better than the conventional structure [19,20]. This issue is addressed in more detail in section 4.…”

Section: Blocking the Permeation Of Oxygen And/or Water Moleculesmentioning

confidence: 99%

“…Since the buffer is too thin, C 60 is still vulnerable to oxygen permeation in devices with the conventional structure. Recently, an inverted structure of acceptor/donor instead of donor/acceptor in small molecule solar cells [19,20] and polymer solar cells [38] has been developed. The stability of these solar cells with the inverted structure under ambient air conditions without encapsulation has been greatly improved [20].…”

Section: Solar Cells With An Inverted Structurementioning

confidence: 99%

“…For the cells based on CuPc/C60 heterojunction structures, a very likely reason for their degradation is the decrease of C 60 conductivity upon oxygen permeation [13,18]. An inverted structure of acceptor/donor instead of donor/acceptor in solar cells has been developed [19,20]. The stability of these solar cells with the inverted structure under ambient air conditions without encapsulation has been greatly improved [20].…”

Section: Introductionmentioning

confidence: 99%

“…An inverted structure of acceptor/donor instead of donor/acceptor in solar cells has been developed [19,20]. The stability of these solar cells with the inverted structure under ambient air conditions without encapsulation has been greatly improved [20].…”

Section: Introductionmentioning

confidence: 99%

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Interfacial processes in small molecule organic solar cells

Song

Sun

et al. 2010

Sci. China Phys. Mech. Astron.

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This paper presents an overview of the recent progress of small molecule organic solar cells mainly based on the previous works of our group. We will mainly focus on the interfacial processes in the cells. The dissociation of excitons at electrode/organic and organic/organic interfaces can be directly observed by transient photovoltage measurements. A simple model including dissociation of excitons at the interface and drift of free carriers in the built-in field is proposed to explain the observed signals of transient photovoltage. Besides exciton-blocking and preventing damage due to cathode evaporation, blocking permeation of oxygen and/or water molecules and modulating the built-in field are proposed as functions of the buffer layer between C 60 and Al. By the use of the inverted structure, a shelf lifetime of over 1500 h is achieved for unencapsulated small-molecule organic solar cells. organic solar cell, interface, organic semiconductor

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Section: Field-induced Free Carrier Separationmentioning

confidence: 99%

Section: Blocking the Permeation Of Oxygen And/or Water Moleculesmentioning

confidence: 99%

Section: Solar Cells With An Inverted Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interfacial processes in small molecule organic solar cells

Song

Sun

et al. 2010

Sci. China Phys. Mech. Astron.

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On the Role of Bathocuproine in Organic Photovoltaic Cells

Gommans

Verreet

Rand

et al. 2008

Adv Funct Materials

158

134

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The effect of bathocuproine (BCP) on the optical and electrical properties of organic planar heterojunction photovoltaic cells is quantified by current–voltage characterization under 1 sun AM 1.5D simulated solar illumination and spectral response at short‐circuit conditions. By inserting a 10 nm BCP layer in an indium tin oxide (ITO)/subphthalocyanine (SubPc)/buckminsterfullerene (C60)/BCP/Al thin‐film structure, an increase in power‐conversion efficiency from 0.05 to 3.0% is observed, mostly reflected in the enhanced open‐circuit voltage up to 920 mV. Furthermore, the incorporation of a 10‐nm BCP layer in an ITO/C60/BCP/Al structure leads to an increase in built‐in potential from 250 to 850 mV, as demonstrated by electroabsorption. It is argued that BCP passivates C60 such that a 10‐nm layer provides a sufficient buffer layer that prohibits Al contacting the C60 where it would otherwise create donor states.

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Direct Free Carrier Photogeneration in Single Layer and Stacked Organic Photovoltaic Devices

Chandran

Foo

et al. 2017

Advanced Materials

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High performance organic photovoltaic devices typically rely on type-II P/N junctions for assisting exciton dissociation. Heremans and co-workers recently reported a high efficiency device with a third organic layer which is spatially separated from the active P/N junction; but still contributes to the carrier generation by passing its energy to the P/N junction via a long-range exciton energy transfer mechanism. In this study the authors show that there is an additional mechanism contributing to the high efficiency. Some bipolar materials (e.g., subnaphthalocyanine chloride (SubNc) and subphthalocyanine chloride (SubPc)) are observed to generate free carriers much more effectively than typical organic semiconductors upon photoexcitation. Single-layer devices with SubNc or SubPc sandwiched between two electrodes can give power conversion efficiencies 30 times higher than those of reported single-layer devices. In addition, internal quantum efficiencies (IQEs) of bilayer devices with opposite stacking sequences (i.e., SubNc/SubPc vs SubPc/SubNc) are found to be the sum of IQEs of single layer devices. These results confirm that SubNc and SubPc can directly generate free carriers upon photoexcitation without assistance from a P/N junction. These allow them to be stacked onto each other with reversible sequence or simply stacking onto another P/N junction and contribute to the photocarrier generation.

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Small-molecular organic solar cells with C60/Al composite anode

Cited by 41 publications

References 24 publications

Interfacial processes in small molecule organic solar cells

Interfacial processes in small molecule organic solar cells

On the Role of Bathocuproine in Organic Photovoltaic Cells

Direct Free Carrier Photogeneration in Single Layer and Stacked Organic Photovoltaic Devices

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