A Strategy to Design a Donor–π–Acceptor Polymeric Hole Conductor for an Efficient Perovskite Solar Cell

Kim, Guan‐Woo; Kim, Jinseck; Lee, Gang‐Young; Kang, Gyeongho; Lee, Jaechul; Park, Jin Young

doi:10.1002/aenm.201500471

Cited by 57 publications

(32 citation statements)

References 55 publications

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“…Organic‐inorganic halide perovskite materials have recently been employed in several types of optoelectronic devices, including thin‐film transistors, lasing, solar cells, light‐emitting diodes, and flexible memory devices, due to their outstanding properties. These properties include long charge carrier diffusion length, highly efficient ambipolar charge transport ability, wide optical absorption, and large absorption coefficients .…”

Section: Methodsmentioning

confidence: 99%

Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines—Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells

Pham

Feron

et al. 2017

Sol. RRL

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In this report, two simple cost efficient solution processable small molecular hole transporting materials (HTMs) are synthesized and used successfully in inverted perovskite devices. These HTMs, namely (E)‐4,4'‐(ethene‐1,2‐diylbis(thiophene‐5,2‐diyl))bis(N,N‐bis(4‐methoxyphenyl)aniline) (TPA‐TVT‐TPA) and 4,4'‐(naphthalene‐2,6‐diyl)bis(N,N‐bis(4‐methoxyphenyl)aniline) (TPA‐NAP‐TPA), are designed by using triphenylamine methoxy as common end capping groups with thienylvinylenethienyl and naphthalene cores respectively. They possess good solubility in common organic solvents. Additionally, they have not only appropriate highest occupied molecular orbital energy levels for good hole injection ability but also sufficient lowest unoccupied molecular orbital for electron blocking capability. The power conversion efficiency (PCE) of these HTMs based devices is found to be of 16.32% for TPA‐TVT‐TPA and 14.63% for TPA‐NAP‐TPA. Particularly, TPA‐TVT‐TPA exhibits an impressive Voc of 1.07 V. The obtained performance is one of the highest performances in inverted perovskite layouts. The cut‐price and straightforward synthesis with elegant scale up makes these classes of materials important for the industry to produce high‐throughput printed perovskite solar cells for large area applications.

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Section: Methodsmentioning

confidence: 99%

Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines—Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells

Pham

Feron

et al. 2017

Sol. RRL

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“…21 To increase the solubility of the polymer, we adopted random polymerization, which causes perturbation of the structures. 22 We synthesized two polymers, P1 and P2, with benzodithiophene and thiophene as bridge, respectively ( Fig. 1), which are representative electron donating units.…”

Section: Materials Design and Characterizationmentioning

confidence: 99%

A feasible random copolymer approach for high-efficiency polymeric photovoltaic cells

Lee

Bang

et al. 2016

J. Mater. Chem. A

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Two random copolymers based on the (2,5-difluorophenylene)dithiophene and dialkoxybenzothiadiazole with benzodithiophene (P1) or thiophene (P2) as third conjugated bridges having sulfur and fluorine (S···F) and/or oxygen (S···O) non-covalent intramolecular interaction are synthesized and characterized. In despite of molecular weight difference over three times between both polymers, P1 and P2 possess similar solubility in organic solvents and thermal stability (Td~320 o C), which means probably due to that P1 with bulky alkylthiophene substituted benzodithiophene as a third conjugated bridge has less non-covalent intramolecular interaction than that of P2 with thiophene as a bridge. Both polymers were used as electron donors in bulk heterojunction organic photovoltaics (BHJ OPV) with PC71BM as an acceptor. From the photovoltaic measurements, it reveals that P2 shows higher power conversion efficiency (PCE) of up to 6.82% than that of P1 (2.44%). After 1,8-diiodooctane (DIO) treatments as a processing additive, the P1 and P2 devices show a significantly improved PCE of 5.95% for P1 and 7.71% for P2. The surface morphology analysis of the blend films using the atomic force microscope (AFM) reveals that P1:PC71BM film shows a macrophase separation, while the P2 film has a smooth morphology. After DIO treatment, morphology of both polymer blend films is improved with better bi-continuous nanosclae networks. Charge carrier mobilities through the space charge limited current (SCLC) method demonstrate that P2 with thiophene bridge has higher charge carrier mobilities than that of P1. In particular, inverted structured BHJ OPV with P2 exhibits a PCE of 8.50%, which is the highest PCE reported in the literature regarding random copolymers.

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“…For example, polymers like PTAA (poly(triaryl amine)), P3HT (poly(3-hexylthiophene)), and PCBTDPP (poly[N-9'-heptadecanyl-2,7carbazole-alt-3,6-bis(thiophen-5-yl)-2,5-dioctyl-2,5-dihydropyrrolo [3,4]pyrrole-1,4-dione]) have been employed as efficient HTMs for PSCs. [28][29][30] However, batch-to-batchv ariation and difficulties in purification are unavoidablep roblemsf or polymers. In contrast, small organic molecules are convenient to synthesize and their structures are easy to tailor to achieve satisfactory properties.…”

Section: Introductionmentioning

confidence: 99%

m‐Methoxy Substituents in a Tetraphenylethylene‐Based Hole‐Transport Material for Efficient Perovskite Solar Cells

Liu

Wang

et al. 2016

Chemistry A European J

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Three tetrapheynlethylene derivatives (N,N-di(4-methoxyphenyl)aminophenyl-substituted tetraphenylethylene; TPE-4DPA) with different methoxy positions (pp-, pm-, and po-) have been synthesized and characterized. The methoxy groups can control the oxidation potential of the materials, and the electronic properties of the derivatives were affected by the position of the methoxy substituents. These compounds were synthesized in a facile and cost-effective way, and were applied as hole-transport materials in perovskite solar cells. The corresponding cell performances were compared with respect to their structure modifications, and it was found that the derivative with m-OMe substituents showed the highest power conversion efficiency (PCE) of 15.4 %, with a J value of 20.04 mA cm , a V value of 1.07 V, and a fill factor (FF) value of 0.72, which is higher than the p-OMe and o-OMe substituents. Moreover, the PCE of pm-TPE-4DPA is comparable with that of the state-of-the-art 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)-9,9'-spirobifluorene under identical conditions.

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A Strategy to Design a Donor–π–Acceptor Polymeric Hole Conductor for an Efficient Perovskite Solar Cell

Cited by 57 publications

References 55 publications

Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines—Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells

Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines—Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells

A feasible random copolymer approach for high-efficiency polymeric photovoltaic cells

m‐Methoxy Substituents in a Tetraphenylethylene‐Based Hole‐Transport Material for Efficient Perovskite Solar Cells

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