Enhanced performance of perovskite solar cells with P3HT hole-transporting materials via molecular p-type doping

Zhang, Yuchen; Elawad, Mohammed; Yu, Ze; Jiang, Xiaoqing; Lai, Jianbo; Sun, Licheng

doi:10.1039/c6ra21775c

Cited by 86 publications

(43 citation statements)

References 29 publications

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“…F4TCNQ has been widely used as an effective p-typed opant for organic molecules and conducting polymers. [37] The LUMO level of F4TCNQ (À5.24 eV) matches well the HOMO level of CuPc-OTPAtBu (À5.22 eV),e nabling it to facilitate electron transfer from the HOMO level of the CuPc-OTPAtBu to the LUMO level of the F4TCNQ( so-called pdoping). P-doping is expected to generate more positive chargesi nt he mixture, thus increasing the bulk conductivity of the CuPc-OTPAtBu film.T he introduction of F4TCNQi nto CuPc-OTPAtBu indeed significantly increases the conductivity as expected ( Figure 2c).…”

Section: Resultsmentioning

confidence: 83%

“…[36] The hole conductivity of aH TM is av ery important parameter to guarantee an effective transportation/collection of the photo-generatedh oles from the perovskite absorber.T he conductivity of pristine CuPc-OTPAtBu is estimated to be 5 10 À7 Scm À1 ,m easured by using at wo-contact electrical conductivitys etup (Figure 2c). [37] The LUMO level of F4TCNQ (À5.24 eV) matches well the HOMO level of CuPc-OTPAtBu (À5.22 eV),e nabling it to facilitate electron transfer from the HOMO level of the CuPc-OTPAtBu to the LUMO level of the F4TCNQ( so-called pdoping). [37] The LUMO level of F4TCNQ (À5.24 eV) matches well the HOMO level of CuPc-OTPAtBu (À5.22 eV),e nabling it to facilitate electron transfer from the HOMO level of the CuPc-OTPAtBu to the LUMO level of the F4TCNQ( so-called pdoping).…”

Section: Resultsmentioning

confidence: 99%

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Interfacial Engineering of Perovskite Solar Cells by Employing a Hydrophobic Copper Phthalocyanine Derivative as Hole‐Transporting Material with Improved Performance and Stability

Jiang

Lai

et al. 2017

ChemSusChem

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In high-performance perovskite solar cells (PSCs), hole-transporting materials (HTMs) play an important role in extracting and transporting the photo-generated holes from the perovskite absorber to the cathode, thus reducing unwanted recombination losses and enhancing the photovoltaic performance. Herein, solution-processable tetra-4-(bis(4-tert-butylphenyl)amino)phenoxy-substituted copper phthalocyanine (CuPc-OTPAtBu) was synthesized and explored as a HTM in PSCs. The optical, electrochemical, and thermal properties were fully characterized for this organic metal complex. The photovoltaic performance of PSCs employing this CuPc derivative as a HTM was further investigated, in combination with a mixed-ion perovskite as a light absorber and a low-cost vacuum-free carbon as cathode. The optimized devices [doped with 6 % (w/w) tetrafluoro-tetracyano-quinodimethane (F4TCNQ)] showed a decent power conversion efficiency of 15.0 %, with an open-circuit voltage of 1.01 V, a short-circuit current density of 21.9 mA cm , and a fill factor of 0.68. Notably, the PSC devices studied also exhibited excellent long-term durability under ambient condition for 720 h, mainly owing to the introduction of the hydrophobic HTM interlayer, which prevents moisture penetration into the perovskite film. The present work emphasizes that solution-processable CuPc holds a great promise as a class of alternative HTMs that can be further explored for efficient and stable PSCs in the future.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Interfacial Engineering of Perovskite Solar Cells by Employing a Hydrophobic Copper Phthalocyanine Derivative as Hole‐Transporting Material with Improved Performance and Stability

Jiang

Lai

et al. 2017

ChemSusChem

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“…In PSCs, F6TCNNQ molecules were used to lower the E F of a NiO x HTM from −4.63 to −5.07 eV and reduce the gap of VB– E F from 0.58 to 0.29 eV, resulting in an enhancement of the device performance . Furthermore, 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4TCNQ) molecules were adopted via a solution‐processed doping process to improve the film conductivity and energy levels of PTAA, P3HT, and PEDOT:PSS, respectively, contributing to the increased power conversion efficiency (PCE) of devices with increased hole‐extraction effect. However, little is known about the relationship between this modified effect and the electron affinity (EA) of the organic monomolecular materials, which need further exploration for more efficient modified molecular design.…”

Section: Photovoltaic Parameters Obtained From the Optimized Devices mentioning

confidence: 99%

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

Zhang

et al. 2020

Advanced Energy Materials

236

212

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Inverted perovskite solar cells (PSCs) with low‐temperature processed hole transporting materials (HTMs) suffer from poor performance due to the inferior hole‐extraction capability at the HTM/perovskite interfaces. Here, molecules with controlled electron affinity enable a HTM with conductivity improved by more than ten times and a decreased energy gap between the Fermi level and the valence band from 0.60 to 0.24 eV, leading to the enhancement of hole‐extraction capacity by five times. As a result, the 3,6‐difluoro‐2,5,7,7,8,8‐hexacyanoquinodimethane molecules are used for the first time enhancing open‐circuit voltage (Voc) and fill factor (FF) of the PSCs, which enable rigid‐and flexible‐based inverted perovskite devices achieving highest power conversion efficiencies of 22.13% and 20.01%, respectively. This new method significantly enhances the Voc and FF of the PSCs, which can be widely combined with HTMs based on not only NiOx but also PTAA, PEDOTT:PSS, and CuSCN, providing a new way of realizing efficient inverted PSCs.

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“…Conductive polymers have attracted a strong interest owing to their excellent charge carrier mobility, good processability, and the possibility to scale up their production . Among them, PTAA has been shown to be very suitable for high efficient PSCs even though the high cost may limit its use in real applications. Recently, many studies have been conducted on P3HT as HTL due to its unique properties, such as high hole mobility (0.1 cm 2 V −1 s −1 ), wide band gap (WBG), good solubility, thermal stability, and low cost (10 times cheaper than spiro‐OMeTAD) .…”

Section: Introductionmentioning

confidence: 99%

Doping Strategy for Efficient and Stable Triple Cation Hybrid Perovskite Solar Cells and Module Based on Poly(3‐hexylthiophene) Hole Transport Layer

Nia

Lamanna

Zendehdel

et al. 2019

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As the hole transport layer (HTL) for perovskite solar cells (PSCs), poly(3‐hexylthiophene) (P3HT) has been attracting great interest due to its low‐cost, thermal stability, oxygen impermeability, and strong hydrophobicity. In this work, a new doping strategy is developed for P3HT as the HTL in triple‐cation/double‐halide ((FA1−x−yMAxCsy)Pb(I1−xBrx)3) mesoscopic PSCs. Photovoltaic performance and stability of solar cells show remarkable enhancement using a composition of three dopants Li‐TFSI, TBP, and Co(III)‐TFSI reaching power conversion efficiencies of 19.25% on 0.1 cm2 active area, 16.29% on 1 cm2 active area, and 13.3% on a 43 cm2 active area module without using any additional absorber layer or any interlayer at the PSK/P3HT interface. The results illustrate the positive effect of a cobalt dopant on the band structure of perovskite/P3HT interfaces leading to improved hole extraction and a decrease of trap‐assisted recombination. Non‐encapsulated large area devices show promising air stability through keeping more than 80% of initial efficiency after 1500 h in atmospheric conditions (relative humidity ≈ 60%, r.t.), whereas encapsulated devices show more than >500 h at 85 °C thermal stability (>80%) and 100 h stability against continuous light soaking (>90%). The boosted efficiency and the improved stability make P3HT a good candidate for low‐cost large‐scale PSCs.

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Enhanced performance of perovskite solar cells with P3HT hole-transporting materials via molecular p-type doping

Abstract: Tetrafluoro-tetracyano-quinodimethane (F4TCNQ) was demonstrated to be an effective p-dopant for highly efficient PSCs based on P3HT as a hole-transporting material.

Cited by 86 publications

References 29 publications

Interfacial Engineering of Perovskite Solar Cells by Employing a Hydrophobic Copper Phthalocyanine Derivative as Hole‐Transporting Material with Improved Performance and Stability

Interfacial Engineering of Perovskite Solar Cells by Employing a Hydrophobic Copper Phthalocyanine Derivative as Hole‐Transporting Material with Improved Performance and Stability

High Electron Affinity Enables Fast Hole Extraction for Efficient Flexible Inverted Perovskite Solar Cells

Doping Strategy for Efficient and Stable Triple Cation Hybrid Perovskite Solar Cells and Module Based on Poly(3‐hexylthiophene) Hole Transport Layer

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