Simplified Tandem Polymer Solar Cells with an Ideal Self‐Organized Recombination Layer

Kang, Hongkyu; Kee, Seyoung; Yu, Kilho; Lee, Jinho; Kim, Geunjin; Kim, Junghwan; Kim, Jae-Ryoung; Kong, Jaemin; Lee, Kwang-Hee

doi:10.1002/adma.201404765

Cited by 118 publications

(86 citation statements)

References 33 publications

(65 reference statements)

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“…Wang et al 22 demonstrated that aminobased cathode interfacial materials (fullerene [6,6]-phenyl-C 61 -butyric acid 2-((2-(dimethylamino)-ethyl)(methyl)amino)ethyl ester (PCBDAN) and poly[(9,9-bis(3-(N,N-dimethylamino)propyl)-2,7-uorene)-alt-2,7-(9,9-dioctyluorene)] (PFN)) improve electron selective contacts with ITO when added into the P3HT:PC 61 BM solution at small concentrations. Lee et al 23 showed that polyethyleneimine (PEI) aligned on top of PEDOT:PSS when mixed into the photoactive materials, thereby signicantly simplifying the multi-junction processing. In this approach PEI had to be dissolved in a polar solvent, such as 2-methoxyethanol, before mixing with the photoactive solutions.…”

Section: -27mentioning

confidence: 99%

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

et al. 2016

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We successfully demonstrate a simple approach to printing efficient, inverted organic solar cells (OSCs) with a self-organized charge selective cathode interface layer based on the small-molecule Phen-NaDPO.Different from previous studies, Phen-NaDPO molecules were blended into a polymer/fullerene blend, comprising a low bandgap diketopyrrolopyrrole-quinquethiophene alternating copolymer pDPP5T-2 and phenyl-C 61 -butyric acid methyl ester (PC 61 BM), and processed by doctor blading in air. We observed a spontaneous, surface energy driven migration of Phen-NaDPO towards the ZnO interface and a subsequent formation of electron selective and barrier free extraction contacts. In the presence of 0.5 wt% Phen-NaDPO, a PCE of 5.4% was achieved for the inverted device based on an ITO/ZnO cathode. Notably, the photovoltaic performances remained at the same level with increasing the Phen-NaDPO concentration in the active layer from 0.25 to 1 wt%.Furthermore, this approach could be proven to effectively work with other cathodes such as bare ITO and ITO/AZO. The self-organization of Phen-NaDPO through spontaneous vertical phase separation is mainly attributed to its high surface energy and strong interaction with the cathode material. The present results highlight that a self-organized cathode interfacial material processed from a "ternary" active layer is fully compatible with the requirements for roll-to-roll fabrication of inverted organic solar cells.

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Section: -27mentioning

confidence: 99%

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

et al. 2016

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“…The dipole layer modified the work function of MoO x to eliminate a preexisting counter dipole, resulting in an improvement in PCE. 5 Furthermore, several studies have been conducted to further understand the interface dipole layer, 6 and the interface electrical structure has also been discussed in detail. 7,8 Inverted OPVs have gained much research interest owing to their superior long-term stability compared with devices with a more typical structure.…”

Section: Introductionmentioning

confidence: 99%

Inverted Organic Photovoltaic Cell with ZnO Nanorod Structure

Fukuda

Uratani

2017

Electrochemistry

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The electrical and physical properties at the interface between the ZnO electron transport/collection layer and an organic photoactive layer play important roles in determining photovoltaic performance. Therefore, we have fabricated ZnO nanorods and optimized the coating conditions used for deposition of the ZnO seed layer, which serves as a nucleation site for crystal growth. First, the relationship between the concentration of the ZnO precursor solution (zinc acetate dihydrate and hexamethylenetetramine in methanol) and diameter of the ZnO nanorods was examined, and we showed that the diameter continuously decreased with increasing concentration, reaching a minimum of 23 nm. Further, we investigated density of ZnO nanorods and photovoltaic performance of the inverted cell as a function of the rotation speed used during the spin coating process to deposit the ZnO seed layer. A low density of ZnO nanorods was obtained when the rotation speed was low, and this caused the short circuit current density, open circuit voltage, and fill factor of the organic photovoltaics to decrease. As a result, a maximum photoconversion efficiency of 3.0% was achieved, and this value was 1.6-fold greater than that measured using a reference device containing no ZnO nanorods (photoconversion efficiency: 1.9%).

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“…Efficient strategies for further increasing the PCE of PSCs should rely on full utilization of solar light in a broad coverage and circumventing the Shockley-Queisser limit in standard single-junction devices. Compared with the single-junction PSCs, tandem solar cells cannot only improve light absorption but also reduce thermalization loss of photonic energy by stacking two or more sub-cells with complementary absorption bands, harvesting high and low energy photons in the separated sub-cells [10][11][12][13]. However, the fabrication process of tandem solar cells is complicate, leading to an increased cost and a decreased yield, which is in contrast to the attractive simplicity of the single-step solution processing for inexpensive solar cells.…”

Section: Introductionmentioning

confidence: 99%

Perspective of a new trend in organic photovoltaic: ternary blend polymer solar cells

2016

Sci. China Mater.

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In the past few years, ternary polymer solar cells (PSCs) have emerged as a promising structure to simultaneously improve all solar cell parameters compared with traditional binary PSCs. The third component in ternary PSCs can play versatile functions to enhance the device performance. In this review, we summarize the design rules for fabricating high-performance ternary PSCs and introduce the recent progress in this field. In addition, the characterization methods for determining the role of the third component played in ternary PSCs are described.

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Simplified Tandem Polymer Solar Cells with an Ideal Self‐Organized Recombination Layer

Cited by 118 publications

References 33 publications

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

Roll to roll compatible fabrication of inverted organic solar cells with a self-organized charge selective cathode interfacial layer

Inverted Organic Photovoltaic Cell with ZnO Nanorod Structure

Perspective of a new trend in organic photovoltaic: ternary blend polymer solar cells

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