Enhanced Performance of Inverted Non-Fullerene Organic Solar Cells by Using Metal Oxide Electron- and Hole-Selective Layers with Process Temperature ≤150 °C

You, Hailong; Dai, Lin; Zhang, Qianni; Chen, Dazheng; Jiang, Qubo; Zhang, Chunfu

doi:10.3390/polym10070725

Cited by 8 publications

(6 citation statements)

References 44 publications

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“…Although PEIE is an insulator, in low thickness it can allow charge injection through either tunnelling or thermionic injection, [ 27 ] which can explain for the highest dark current density in case of only PEIE as the ETL. ZnO acts as a hole blocking layer with ionization potential (IP) of around 7.8 eV, [ 28 ] which is much deeper than that of the active layer materials (Figure 1d). ZnO layer with insulating nature of PEIE may predicate as an effective hole‐blocking and electron‐transporting layer, potentially supporting the reason for lowest dark current density in the case of the bilayer as ETL.…”

Section: Resultsmentioning

confidence: 99%

Toward Faster Organic Photodiodes: Tuning of Blend Composition Ratio

Saggar

Sanderson

Gedefaw

et al. 2021

Adv Funct Materials

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The ability of a light‐sensor to detect fast variation in incident light intensity is a vital feature required in imaging and data transmission applications. Solution‐processed bulk heterojunction (BHJ) type organic photodiodes (OPDs) have gone through key developments, including dark current mitigation and longer linear dynamic range. In contrast, there has been less focus on increasing OPD response speed (f–3dB). Here, bulk heterojunction OPDs based on electron‐donating polymer poly[thiophene‐2,5‐diyl‐alt‐5,10‐bis((2‐hexyldecyl)oxy)dithieno[3,2‐c:3′,2′‐h][1,5]naphthyridine‐2,7‐diyl] (or PTNT) and electron‐accepting phenyl‐C71‐butyric acid methyl ester (or PC71BM) are reported. The intrinsic charge transport characteristics required for fast speed OPDs are discussed, and an analytical model for the same is developed. The OPDs present 0.8 MHz f–3dB under no applied voltage bias for a typical blend ratio of 1:1 by weight. It is shown that balanced electron and hole mobility is a critical criterion for faster speed OPDs, which can be realized by tuning the composition ratio of the bulk heterojunction. By tuning PTNT and PC71BM blend ratio, the f–3dB was successfully raised by more than quadruple to 4.5 MHz. The findings provide a tool to set device architecture for faster next‐generation light sensors.

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Section: Resultsmentioning

confidence: 99%

Toward Faster Organic Photodiodes: Tuning of Blend Composition Ratio

Saggar

Sanderson

Gedefaw

et al. 2021

Adv Funct Materials

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“…The inverted architecture (glass/ITO/ZnO/PTNT:PC 71 BM/MoO 3 /Ag) was selected as it has a higher stability than conventional devices due to the absence of a low work function electrode. ZnO is one of the most commonly used inorganic components in organic solar cells [31,32]. It has a lower LUMO energy level than that of the acceptor, which is helpful for the extraction of electrons, and it has a lower HOMO level than that of the polymer donor, and hence blocks the holes from flowing towards the ITO cathode.…”

Section: Resultsmentioning

confidence: 99%

Optimizing Polymer Solar Cells Using Non-Halogenated Solvent Blends

2019

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More environmentally friendly polymer solar cells were constructed using a conjugated polymer, poly (2,5-thiophene-alt-4,9-bis(2-hexyldecyl)-4,9-dihydrodithieno[3,2-c:3′,2′h][1,5] naphthyridine-5,10-dione, PTNT, as a donor material in combination with PC71BM as an acceptor in a bulk heterojunction device structure. A non-halogenated processing solvent (o-xylene) and solvent additives that are less harmful to the environment such as 1-methoxynaphthalene (MN) and 1-phenylnaphthalene (PN) were used throughout the study as processing solvents. The most widely used halogenated solvent additives (1,8-diiodooctane (DIO) and 1-chloronaphthalene (CN)) were also used for comparison and to understand the effect of the type of solvent additives on the photovoltaic performances. Atomic force microscopy (AFM) was employed to investigate the surface morphology of the films prepared in the presence of the various additives. The best-performing polymer solar cells provided a high open-circuit voltage of 0.9 V, an efficient fill factor of around 70%, and a highest power conversion efficiency (PCE) of over 6% with the use of the eco-friendlier o-xylene/MN solvent systems. Interestingly, the solvent blend which is less harmful and with low environmental impact gave a 20% rise in PCE as compared to an earlier reported device efficiency that was processed from the chlorinated solvent o-dichlorobenzene (o-DCB).

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“…The transparent electron conducting layer can be metal oxides, like zinc oxide (ZnO) or titanium oxide (TiOx), eliminating the problem of the acidic PEDOT:PSS on ITO or FTO. [16] OPVs based on inverted device structures do not only have superior ambient stability but also possess better compatibility to all-solution roll-to-roll processing since metal anodes can be deposited from commercially available colloidal solutions. Figure 3 shows the regular and inverted device structures used for OSCs.…”

Section: Concept Of Solar Cells 21 Device Architecturementioning

confidence: 99%

Hole transport layers in organic solar cells: A review

2022

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Thanks to huge research efforts, organic solar cells have become serious candidates in the field of renewable energy sources, with reported power conversion efficiencies above 19% and operating lifetime surpassing decades. In the thin film stack composing the organic solar cell, the transport layers at interfaces play a key role, as important as the photoactive material itself. Both electron (ETL) and hole (HTL) transport layers are indeed directly involved in the efficiency and stability of the devices, due to the very specific properties required for these interfaces. Focusing on the HTL interface, a large number of materials has been used in organic solar cells, such as 2D materials, conductive polymers or transition metal oxides. In this review, we present the evolution and recent advances in HTL materials that have been employed in manufacturing organic solar cells, by describing their properties and deposition processes, and also relating their use with the fullerene or the new non-fullerene acceptors in the active layer.

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Enhanced Performance of Inverted Non-Fullerene Organic Solar Cells by Using Metal Oxide Electron- and Hole-Selective Layers with Process Temperature ≤150 °C

Cited by 8 publications

References 44 publications

Toward Faster Organic Photodiodes: Tuning of Blend Composition Ratio

Toward Faster Organic Photodiodes: Tuning of Blend Composition Ratio

Optimizing Polymer Solar Cells Using Non-Halogenated Solvent Blends

Hole transport layers in organic solar cells: A review

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