Reducing the confinement of PBDB-T to ITIC to improve the crystallinity of PBDB-T/ITIC blends

Liang, Qiuju; Han, Jie Cai; Song, Chun‐Peng; Yu, Xinge; Smilgies, Detlef‐M.; Zhao, Kui; Liu, Jiangang; Han, Yanchun

doi:10.1039/c8ta05892j

Cited by 95 publications

(101 citation statements)

References 36 publications

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“…The SCLC curves of hole‐only devices are shown in Figure a and the calculated hole mobility ( μ h ) of corresponding devices is summarized in Table . The μ h value of PEDOT:PSS‐based hole‐only device is 2.28 × 10 −4 cm 2 V −1 s −1 , which agrees well with the literature, whereas the μ h value remarkably improves by 50.8% (3.44 × 10 −4 cm 2 V −1 s −1 ), when α‐In 2 Se 3 is used as HTL. We can conclude that the elevated μ h is attributed not only to the smoother active layer deposited on the α‐In 2 Se 3 film and the better microphase separation but also the remarkable conductivity of α‐In 2 Se 3 .…”

Section: Resultssupporting

confidence: 89%

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

Wang

Hou

et al. 2019

Solar RRL

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Herein, a 2D α‐In2Se3 nanosheet, a binary III–VI group compound semiconductor, is fabricated by liquid‐phase exfoliation method, and the photoelectric properties of α‐In2Se3 material are investigated in depth. It is found that α‐In2Se3 film exhibits significant conductivity, outstanding optical transmission, and a suitable work function. Combined with its smooth surface and preferable hydrophobicity, α‐In2Se3 film can efficiently facilitate hole transporting in the polymer solar cells (PSCs). Due to the aforesaid advantages, a 2D α‐In2Se3 nanosheet is used as a hole transport layer (HTL) in conventional PSCs for the first time, and a relatively high power conversion efficiency (PCE) of 9.58% is achieved with the structure of ITO/α‐In2Se3/PBDB‐T:ITIC/Ca/Al, which is comparable with poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)‐based devices (9.50%). Interestingly, it is demonstrated that the α‐In2Se3 film possesses excellent thermal stability in the range from room temperature to 280 °C, and a PCE of 9.35% is achieved without annealing treatment of α‐In2Se3 film, which exhibits a great potential of α‐In2Se3 for an annealing‐free approach. Furthermore, the incorporation of α‐In2Se3 HTL also remarkably enhances the long‐term stability of PSCs compared with PEDOT:PSS‐based devices. So, the results show that 2D α‐In2Se3 is a promising candidate to be an efficient and stable hole‐extraction layer.

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Section: Resultssupporting

confidence: 89%

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

Wang

Hou

et al. 2019

Solar RRL

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“…The absorption spectrum of blend film is from 500 to 800 nm. As a classic system, lots of work were devoted to performance optimization and mechanism research of PBDB-T/ITIC devices Zhao W. C. et al, 2016;Pan et al, 2017;An et al, 2018;Bi et al, 2018;Liang et al, 2018). Here, we mainly study the film-depth-dependent optical and electrical properties by the in situ instrument.…”

Section: Device Performance and Film-depth-dependent Light Absorptionmentioning

confidence: 99%

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

et al. 2020

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Organic donor-acceptor bulk heterojunction are attracting wide interests for solar cell applications due to solution processability, mechanical flexibility, and low cost. The photovoltaic performance of such thin film is strongly dependent on vertical phase separation of each component. Although film-depth-dependent light absorption spectra measured by non-in situ methods have been used to investigate the film-depth profiling of organic semiconducting thin films, the in situ measurement is still not well-resolved. In this work, we propose an in situ measurement method in combination with a self-developed in situ instrument, which integrates a capacitive coupled plasma generator, a light source, and a spectrometer. This in situ method and instrument are easily accessible and easily equipped in laboratories of the organic electronics, which could be used to conveniently investigate the film-depth-dependent optical and electronic properties.

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“…Moreover, the strong electronic coupling is only expected for molecules oriented with their π systems parallel to each other, leading to weak driving force for aggregation . Hence, when blended with donor materials, SMAs exhibits weak crystallinity, even after postannealing process . Taking poly(3‐hexylthiophene) (P3HT): (5Z, 5′Z)‐5,5′‐((7,7′‐(4,4,9,9‐tetraoctyl‐4,9‐dihydro‐s‐indaceno[1,2‐b:5,6‐b′]dithiophene‐2,7‐diyl)bis (benzo [c][1,2,5]thiadiazole7,4diyl)) bis(methanylylidene)) bis (3‐ethyl‐2‐thioxothiazolidin‐4‐one) (O‐IDTBR) blend system for instance, the highest reported efficiency of 6.4% for P3HT‐based nonfullerene devices is achieved after thermal annealing (10 min at 130 °C) .…”

Section: Introductionmentioning

confidence: 99%

Separating Crystallization Process of P3HT and O‐IDTBR to Construct Highly Crystalline Interpenetrating Network with Optimized Vertical Phase Separation

Liang

Jiao

et al. 2019

Adv Funct Materials

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The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining the charge transport and collec tion in polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, the crystallization of polymer and SMAs usually occurs simultaneously during film-forming, thus interfering with the crystallization process of each other, leading to amorphous film with undesirable lateral and vertical phase separation. The poly(3-hexylthiophene) (P3HT):O-IDTBR blend is selected as a model system, and controlling film-forming kinetics to solve these problems is proposed. Herein, a cosolvent 1,2,4-triclorobenzene (TCB) with selective solubility and a high boiling point is added to the solution, leading to prior crystallization of P3HT and extended film-forming duration. As a result, the crystallinity of both components is enhanced significantly. Meanwhile, the prior crystallization of P3HT induces solid-liquid phase separation, hence rationalizing the formation of the nano-interpenetrating network. Moreover, the surface energy drives O-IDTBR to enrich near the cathode and P3HT to migrate to the anode. Consequently, a highly crystalline nano-interpenetrating network with proper vertical phase separation is obtained. The optimal morphology improves charge transport and suppresses bimolecular recombination, boosting the power conversion efficiency from 4.45% to 7.18%, which is the highest performance in P3HT-based binary nonfullerene solar cells.

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Reducing the confinement of PBDB-T to ITIC to improve the crystallinity of PBDB-T/ITIC blends

Abstract: The ordered aggregation of non-fullerene small molecular acceptors (SMAs) plays a key role in determining the charge transport and bimolecular recombination in polymer/SMA solar cells.

Cited by 95 publications

References 36 publications

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

Separating Crystallization Process of P3HT and O‐IDTBR to Construct Highly Crystalline Interpenetrating Network with Optimized Vertical Phase Separation

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Reducing the confinement of PBDB-T to ITIC to improve the crystallinity of PBDB-T/ITIC blends

Abstract: The ordered aggregation of non-fullerene small molecular acceptors (SMAs) plays a key role in determining the charge transport and bimolecular recombination in polymer/SMA solar cells.

Cited by 95 publications

References 36 publications

Solution‐Processable 2D α‐In2Se3 as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

Solution‐Processable 2D α‐In2Se3 as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

In situ Measuring Film-Depth-Dependent Light Absorption Spectra for Organic Photovoltaics

Separating Crystallization Process of P3HT and O‐IDTBR to Construct Highly Crystalline Interpenetrating Network with Optimized Vertical Phase Separation

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Product

Resources

About

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells

Solution‐Processable 2D α‐In₂Se₃ as an Efficient Hole Transport Layer for High‐Performance and Stable Polymer Solar Cells