A simple merocyanine tandem solar cell with extraordinarily high open-circuit voltage

Steinmann, Vera; Kronenberg, Nils M.; Lenze, Martin R.; Graf, Steven Michael; Hertel, Dirk; Bürckstümmer, Hannah; Würthner, Frank; Meerholz, Klaus

doi:10.1063/1.3657145

Cited by 15 publications

(18 citation statements)

References 20 publications

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“…Merocyanines have been recently revisited as donor materials for OPV by Würthner Meerholz et al who synthesized and investigated several series of these molecules . In a paper published in 2008 two series of merocyanines with 2‐aminothiophene ( 48 ) or indoline ( 49 ) as donor block were used in BHJ solar cells.…”

Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

“…The largest V oc value of 0.90 V was observed for compound 49 . In the aminothiophene series, the best results were obtained with compound 48 which led to a V oc of 0.73 V and a J sc of 4.0 mA cm −2 with a PCE of 0.91% . Cells based on indoline donors gave larger J sc namely 5.30 and 6.30 mA cm −2 for 49 and 50 respectively and V oc of 0.90 and 0.76 V leading to PCE of 1.54 and 1.74 %.…”

Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

“…Compound 49 was subsequently used to fabricate a tandem cell based on two identical junctions in series. The resulting tandem cell gave PCE of 4.80% and a very high voltage of 2.10V . More recently, starting from the structure of compound 49 , these authors have designed two new molecules in which the donor block is rigidified by a covalent bridge ( 51 , 52 ) .…”

Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

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Molecular Materials for Organic Photovoltaics: Small is Beautiful

2014

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An overview of some recent developments of the chemistry of molecular donor materials for organic photovoltaics (OPV) is presented. Although molecular materials have been used for the fabrication of OPV cells from the very beginning of the field, the design of molecular donors specifically designed for OPV is a relatively recent research area. In the past few years, molecular donors have been used in both vacuum-deposited and solution-processed OPV cells and both fields have witnessed impressive progress with power conversion efficiencies crossing the symbolic limit of 10 %. However, this progress has been achieved at the price of an increasing complexity of the chemistry of active materials and of the technology of device fabrication. This evolution probably inherent to the progress of research is difficult to reconcile with the necessity for OPV to demonstrate a decisive economic advantage over existing silicon technology. In this short review various classes of molecular donors are discussed with the aim of defining possible basic molecular structures that can combine structural simplicity, low molecular weight, synthetic accessibility, scalability and that can represent possible starting points for the development of simple and cost-effective OPV materials.

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Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

Section: Molecular Donors Based On Low Molecular Weight Chromophoresmentioning

confidence: 99%

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Molecular Materials for Organic Photovoltaics: Small is Beautiful

2014

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“…In this work, dynamic Stark shift spectroscopy in combination with photocurrent measurements are employed for the investigation of the charge drift dynamics in thin films of pristine PC 61 BM and in its blend with merocyanine molecule (MD376/PC 61 BM blend) [19][20][21]. We examine the role of charge screening and show that this effect leads to qualitatively different interpretation of the electron mobility dynamics.…”

Section: à3mentioning

confidence: 99%

Time-independent, high electron mobility in thin PC 61 BM films: Relevance to organic photovoltaics

Devižis

Hertel

Meerholz

et al. 2014

Organic Electronics

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a b s t r a c tUltrafast optical probing of electric field by means of electroabsorption combined with conventional photocurrent measurements was employed to investigate the drift and mobility dynamics of photo-generated charge carriers in the pristine PC 61 BM film and in the blend with a merocyanine dye. Electrons passed a 40 nm thick PC 61 BM film within a few picoseconds with time-independent and weakly dispersive mobility. The electron mobility is 1 cm 2 /(V s) at 1 MV/cm and an estimate of the zero-field mobility yields 5 Á 10 À2 cm 2 /(V s). The initial electron mobility in the blend is of the order of 10 À2 cm 2 / (V s) and decreases rapidly. We conclude that electron motion in PC 61 BM based organic bulk hetero-junction solar cells is limited by barriers between PC 61 BM domains rather than by intrinsic PC 61 BM properties.

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“…This offers the possibility of not only enhancing Jsc by wide wavelength photon harvesting but also enhancement in the Voc by connecting the top and bottom cells in series. In the case of series connected tandem solar cells non-complimentary light absorption by top and bottom cells, although leads to enhanced Voc but final out external PCE is either unchanged are slightly improved [26][27]. Taking these points in to consideration we have utilized sensitizing dyes D131, N719 and PC25 having complementary electron absorption spectra which has been shown in the figure 3 along with their molecular structure [15,25].…”

Section: Resultsmentioning

confidence: 99%