High Efficiency Inverted Organic Solar Cells with a Neutral Fulleropyrrolidine Electron-Collecting Interlayer

Xu, Weidong; Yan, Congfei; Kan, Zhipeng; Wang, Yan; Lai, Wen‐Yong; Huang, Wei

doi:10.1021/acsami.6b03974

Cited by 39 publications

(28 citation statements)

References 43 publications

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“…With respect to ease of processing, a major bottleneck in adopting polyelectrolyte‐based interlayers for printable OSCs lies in the extremely high sensitivity of device performance to interlayer thickness. [ 72–86 ] In general, the optimal interlayer thickness is less than 10 nm, beyond which device performance will significantly deteriorate as the interlayer thickness is further increased, which is attributed to the insulating nature of nonconjugated polyelectrolytes. In contrast, conjugated polyelectrolytes (CPEs) are relatively free from this problem by providing good electron transporting capabilities.…”

Section: Recent Progress In Device Performancementioning

confidence: 99%

Recent Progress and Challenges toward Highly Stable Nonfullerene Acceptor‐Based Organic Solar Cells

Wang

Lee

Hou

et al. 2020

Advanced Energy Materials

195

178

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Organic solar cells (OSCs) based on nonfullerene acceptors (NFAs) have made significant breakthrough in their device performance, now achieving a power conversion efficiency of ≈18% for single junction devices, driven by the rapid development in their molecular design and device engineering in recent years. However, achieving long‐term stability remains a major challenge to overcome for their commercialization, due in large part to the current lack of understanding of their degradation mechanisms as well as the design rules for enhancing their stability. In this review, the recent progress in understanding the degradation mechanisms and enhancing the stability of high performance NFA‐based OSCs is a specific focus. First, an overview of the recent advances in the molecular design and device engineering of several classes of high performance NFA‐based OSCs for various targeted applications is provided, before presenting a critical review of the different degradation mechanisms identified through photochemical‐, photo‐, and morphological degradation pathways. Potential strategies to address these degradation mechanisms for further stability enhancement, from molecular design, interfacial engineering, and morphology control perspectives, are also discussed. Finally, an outlook is given highlighting the remaining key challenges toward achieving the long‐term stability of NFA‐OSCs.

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Section: Recent Progress In Device Performancementioning

confidence: 99%

Recent Progress and Challenges toward Highly Stable Nonfullerene Acceptor‐Based Organic Solar Cells

Wang

Lee

Hou

et al. 2020

Advanced Energy Materials

195

178

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“…Interfacial materials play an important role in various optoelectronic applications including organic photodetectors, perovskite solar cells (PSCs), organic light-emitting diodes (OLEDs), and organic solar cells (OSCs). − Interface modification is an alternative strategy to suppress the dark current densities of OPD devices without sacrificing the photoresponsiveness. , For instance, the use of poly[ N , N ′-bis(4-butylphenyl)- N , N ′-bis(phenyl)benzidine] as the anode interfacial layer can significantly reduce the dark current density ( J d ) by approximately 2 orders of magnitude . As the most extensively used anode interfacial layer in the solution-processed OPD devices, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has a high optical transparency and a sufficiently high conductivity .…”

Section: Introductionmentioning

confidence: 99%

Copper Thiocyanate as an Anode Interfacial Layer for Efficient Near-Infrared Organic Photodetector

Huang

Zhong

Peng

et al. 2020

ACS Appl. Mater. Interfaces

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Interfacial modification between the electrode and the overlying organic layer has significant effects on the charge injection and collection and thus the device performance of organic photodetectors. Here, we used copper(I) thiocyanate (CuSCN) as the anode interfacial layer for organic photodetector, which was inserted between the anode and an organic light-sensitive layer. The CuSCN layer processed with ethyl sulfide solution presented similar optical properties to the extensively used anode interlayer of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), while the relatively shallow conduction band of CuSCN resulted in a much higher electron-injection barrier from the anode and shunt resistance than those of PEDOT:PSS. Moreover, the CuSCN-based device also exhibited an increased depletion width for the PEDOT:PSS-based device, as indicated by the Mott–Schottky analysis. These features lead to the dramatically reduced dark current density of 2.7 × 10–10 A cm–2 and an impressively high specific detectivity of 4.4 × 1013 cm Hz1/2 W–1 under −0.1 V bias and a working wavelength of 870 nm. These findings demonstrated the great potential of using CuSCN as an anode interfacial layer for developing high-performance near-infrared organic photodetectors.

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“…Sarcosine (248 mg, 2.77 mmol), fullerene-C 60 (200 mg, 0.27 mmol), and 1 (351 mg, 0.56 mmol) were separately placed in a double-neck round flask with a volume of 250 mL. These compounds were degassed, and then toluene (120 mL) was added under N 2 .…”

Section: Experimental Detailsmentioning

confidence: 99%

Design, Synthesis, and Postvapor Treatment of Neutral Fulleropyrrolidine Electron-Collecting Interlayers for High-Efficiency Inverted Polymer Solar Cells

Gong

Zhang

et al. 2019

ACS Appl. Electron. Mater.

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A novel fullerene derivative (FBPNOH) grafted with bilateral polar pendants was explored as an efficient electron-collecting layer (ECL) for inverted polymer solar cells (i-PSCs). Using PTB7-Th:PC71BM as the photoactive material, the devices based on FBPNOH achieved power conversion efficiencies (PCEs) exceeding 8.85%, which are higher than those of the reference devices based on sol–gel ZnO. The impact of postsolvent treatment on the interfacial properties and charge transport ability of interlayers and the corresponding optoelectronic characteristics have been systematically investigated in comparison with those of its unilateral counterpart (FPNOH). The results show that the post-solvent annealing process is beneficial for enhancing the carrier transport and extraction characteristics of fullerene-based ECLs for PSCs. Meanwhile, according to ultraviolet photoelectron spectroscopy, dimethylformamide solvent annealing can further reduce the work function of indium tin oxide. The electron-selective device tests confirmed the improvement in the charge transport ability for the solvent-annealed films, which boosted PCEs to 9.49% and 10.05% for the typical i-PSCs based on FBPNOH and FPNOH as the ECL, respectively. Our findings shed light on further optimizing the molecular design and device engineering of ECLs for photovoltaic applications.

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High Efficiency Inverted Organic Solar Cells with a Neutral Fulleropyrrolidine Electron-Collecting Interlayer

Cited by 39 publications

References 43 publications

Recent Progress and Challenges toward Highly Stable Nonfullerene Acceptor‐Based Organic Solar Cells

Recent Progress and Challenges toward Highly Stable Nonfullerene Acceptor‐Based Organic Solar Cells

Copper Thiocyanate as an Anode Interfacial Layer for Efficient Near-Infrared Organic Photodetector

Design, Synthesis, and Postvapor Treatment of Neutral Fulleropyrrolidine Electron-Collecting Interlayers for High-Efficiency Inverted Polymer Solar Cells

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