Inverted organic photovoltaic cells with high open-circuit voltage

Tong, Xiaoran; Lassiter, Brian E.; Forrest, Stephen R.

doi:10.1016/j.orgel.2009.12.024

Cited by 76 publications

(75 citation statements)

References 23 publications

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“…The most proposed, supposes that the values are the ones mostly suggested knowing 2.3 and 5.3 eV for EA and IP respectively. It is suggested that such IP corresponds to the HOMO of the ED, which facilitates a good band matching and easy hole s collection, while the MoO 3 film behaves as an electron blocking layers [ 28]. However, we have seen that gold is only efficient when ABL is nearly equal to the HOMO of the donor, which is not really the case for MoO 3 in the case of the ED with high value probed in the present study.…”

Section: Discussioncontrasting

confidence: 66%

About the transparent electrode of the organic photovoltaic cells

Bérnède

Nguyen

Cattin

et al. 2011

Eur. Phys. J. Appl. Phys.

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Abstract. Electrodes and the nature of their contact with organic materials play a crucial role in the realization of efficient optoelectronic components. Whether the injection (organic light emittin g diodesOLEDs) or collection (organic photovoltaic cells -OPV cells) of carriers, contacts must be as efficient as possible. To do this, it is customary to refer to electrode surface treatment and / or using a buffer layer all things to optimize the contac t. Efficiency of organic photovoltaic cells based on organic electron donor/organic electron acceptor junctions can be strongly improved when the transparent conductive anode is coated with a buffer layer (ABL). We show that an ultra-thin gold (0.5 nm) or a thin molybdenum oxide (3-5 nm) can be used as efficient ABL. However, the effects of these ABL depend on the highest occupied molecular orbital (HOMO) of different electron donors of the OPV cells. The results indicate that, in the case of metal ABL, a good matching between the work function of the anode and the highest occupied molecular orbital of the donor material is the major factor limiting the hole transfer efficiency. Indeed, gold is efficient as ABL only when the HOMO of the organic donor is clos e to its work function Au . MoO 3 has a wider field of application as ABL than gold , The role of the oxide is not so clearly understand than that of Au , different models proposed to interpret the experimental results are discussed.

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Section: Discussioncontrasting

confidence: 66%

About the transparent electrode of the organic photovoltaic cells

Bérnède

Nguyen

Cattin

et al. 2011

Eur. Phys. J. Appl. Phys.

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“…The first breakthrough with this architecture is a device with a PCE of approximately 1% efficiency reported in 1986 by Tang (using a derivative of pthalocyanine as the donor layer material and a perylene derivative as the acceptor layer material) [2]. Other bilayer devices can be produced by sequential thermal deposition of materials [16][17][18][19] or by solution casting of one soluble material and evaporation of a second layer [20,21].…”

Section: Bilayer Heterojunctionmentioning

confidence: 99%

“…In a BHJ OSC, the active layer is a complex diffusive interface between the two materials in the form of a 'bicontinuous interpenetrating network' to maximize the available interface surface area ( Figure 5). It has a nanoscale interpenetrating network with donor-acceptor phase separation in a length scale of [10][11][12][13][14][15][16][17][18][19][20] nm, which means each interface is within a distance lesser than the exciton diffusion length from the absorbing sites [22,23]. This interesting result shows that one can effectively maximize the exciton dissociation by using a BHJ active layer structure.…”

Section: Bulk Heterojunction (Bhj)mentioning

confidence: 99%

Designs and Architectures for the Next Generation of Organic Solar Cells

et al. 2010

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Organic solar cells show great promise as an economically and environmentally friendly technology to utilize solar energy because of their simple fabrication processes and minimal material usage. However, new innovations and breakthroughs are needed for organic solar cell technology to become competitive in the future. This article reviews research efforts and accomplishments focusing on three issues: power conversion efficiency, device stability and processability for mass production, followed by an outlook for optimizing OSC performance through device engineering and new architecture designs to realize next generation organic solar cells.

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“…7,22,[24][25][26] For example, interfacial CT processes across donor-acceptor pairs were shown to play a crucial role in determining the optoelectronic conversion efficiency of organic semiconductor-based devices. [27][28][29] Our goal in this communication is to illustrate the prospect of tuning rates of CT processes in molecular donoracceptor (D-A) dyads using molecular means, a feat that can positively transform efficiencies achieved in organic semiconductor-based optoelectronic applications. We investigate a series of high profile molecular dyads, including Zn-bacteriochlorin-bacteriochlorin (Zn-Bc-Bc), Zn-chlorinchlorin (Zn-Ch-Ch), and Zn-porphyrin-porphyrin (Zn-P-P).…”

mentioning

confidence: 99%