Dopant-free 3,3′-bithiophene derivatives as hole transport materials for perovskite solar cells

Gong, Genfei; Zhao, Nian; Ni, Debin; Chen, Jianyou; Shen, Yan; Wang, Mingkui; Tu, Guoli

doi:10.1039/c6ta00032k

Cited by 51 publications

(24 citation statements)

References 44 publications

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“…It has been suggested that dopant-free HTMs are advantageous for device stability,a st he dopantsc an be involved in degradation reactions. [34] Therefore different kinds of dopant-free hole-transport materials were developeda nd introduced into Pb-based PSCs. [35][36][37] In this report, we comparet he dopant-free polymer HTMs poly[[2,3-bis(3-octyloxyphenyl)-5,8-quinoxalinediyl]-2,5-thiophenediyl] (TQ1),p oly[N,N'-bis(2-hexyldecyl)isoindigo-6,6'-diyl-alt-3,3''-dioctyl-2,2',5',2''-terthiophene-5,5''-diyl] (P3TI), and P3HT for use in CsBi 3 I 10 -based solar cells.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dopant‐Free Hole‐Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

Zhu

Johansson

2018

ChemSusChem

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The photovoltaic characteristics of CsBi I -based solar cells with three dopant-free hole-conducting polymers are investigated. The effect on charge generation and charge recombination in the solar cells using the different polymers is studied and the results indicate that the choice of polymer strongly affects the device properties. Interestingly, for the solar cell with poly[[2,3-bis(3-octyloxyphenyl)-5,8-quinoxalinediyl]-2,5-thiophenediyl] (TQ1), the photon-to-current conversion spectrum is highly improved in the red wavelength region, suggesting that the polymer also contributes to the photocurrent generation in this case. This report provides a new direction for further optimization of Bi-halide solar cells by using dopant-free hole-transporting polymers and shows that the energy levels and the interaction between the Bi-halide and the conducting polymers are very important for solar cell performance.

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Section: Introductionmentioning

confidence: 99%

The Effect of Dopant‐Free Hole‐Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

Zhu

Johansson

2018

ChemSusChem

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“…This doping leads to decreased long‐term device stability . A number of organic HTMs have been developed recently, which have yielded devices with excellent PCEs . Unfortunately, most of these HTMs require complicated synthetic routes, which is not favorable to industrial and large‐scale production.…”

Section: Introductionmentioning

confidence: 99%

“…[9] An umber of organic HTMs have been developed recently,w hich have yielded devices with excellent PCEs. [9][10][11][12][13] Unfortunately,m ost of theseH TMsr equirec omplicated synthetic routes, which is not favorable to industrial and large-scale production.T herefore, dopant-free HTMs that are simple to synthesis are highly desirable for stable and efficient PSCs. Here, two novel dopant-free HTMs that contain an extended fused-ring core [indacenodithiophene (IDT) or indacenodithienothiophene (IDTT)] with methoxytriphenylamine (TPA) moieties substituted on either side were synthesized and incorporated into PSCs.…”

Section: Introductionmentioning

confidence: 99%

Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

et al. 2017

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Solution-processed hole transporting materials (HTMs) that are dopant-free show promise for use in low-cost, high-performance perovskite solar cells (PSCs). The highest-efficiency PSCs use organic HTMs, many of which have low mobilities and therefore require doping, which lowers the device stability. Additionally, these materials are not easily scaled because they often require complicated synthesis. Two new HTMs (IDT-TPA and IDTT-TPA) were synthesized, which contained either an extended fused-ring indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) core and strong electron-donating methoxytriphenylamine (TPA) groups as the end-capping units. The extended conjugation in the backbone of IDTT-TPA resulted in stronger π-π interactions (3.321 Å) and a higher hole mobility of 6.46×10 cm V s when compared with that of IDT-TPA (9.53×10 cm V s ). A dopant-free, planar PSC that contained IDTT-TPA was fabricated and exhibited a high power conversion efficiency (PCE) of 15.7 %. This cell exhibited a higher PCE and less hysteresis than devices that contained IDT-TPA.

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“…A fine selection of HTM and ETM is required to reduce interfacial recombination and improve charge collection . Compared with efforts of development organic HTMs aiming to improve hole collection efficiency, relatively few studies on inorganic HTMs for perovskite solar cell have been reported, mainly due to limited fabrication methods, such as sintering at high temperature. Recently, NiO acting as HTM has attracted enough attention due to its suitable energy level (VB maximum at −5.2 eV) for efficient hole injection and high hole mobility (∼ 10 −5 ‐10 −3 cm 2 V −1 s −1 ) .…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependent Characteristics of Perovskite Solar Cells

et al. 2017

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In this work we report the characterization of perovskite solar cells with mesoscopic TiO2/Al2O3/NiO/carbon architecture by analyzing the dependence of photovoltaic parameters on temperature and illumination intensity. This perovskite device shows impressive power conversion efficiency at room temperature (>14 %) and at low temperature of 80 K (>5 %). This enables unequivocal identification of the contribution of CH3NH3PbI3 to construction of the built‐in electric field, and thus, the temperature dependent photovoltaic parameters. The typical feature of this type solar cell is that open‐circuit voltage follows behaviour of the dielectric constant of CH3NH3PbI3. In addition, the dependence of current on light intensity shifts from the space‐charge‐limited to diffusion‐limited mechanisms as increasing temperature. By using the observed significant short‐circuit current density of 12.76 mA cm−2 at 80 K the exciton‐binding energy of CH3NH3PbI3 is evaluated to be less 6.9 meV in an operating device, which can be further verified with Elliott's formula.

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Dopant-free 3,3′-bithiophene derivatives as hole transport materials for perovskite solar cells

Abstract: We report three hole transport materials featuring “X” swivel-cruciform structures for stable perovskite solar cells.

Cited by 51 publications

References 44 publications

The Effect of Dopant‐Free Hole‐Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

The Effect of Dopant‐Free Hole‐Transport Polymers on Charge Generation and Recombination in Cesium–Bismuth–Iodide Solar Cells

Dopant‐Free Hole‐Transport Materials Based on Methoxytriphenylamine‐Substituted Indacenodithienothiophene for Solution‐Processed Perovskite Solar Cells

Temperature Dependent Characteristics of Perovskite Solar Cells

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