Balanced Electric Field Dependent Mobilities: A Key to Access High Fill Factors in Organic Bulk Heterojunction Solar Cells

Yin, Hang; Bi, Pengqing; Cheung, Sin Hang; Cheng, Wai Leong; Chiu, Ka Lok; Ho, Carr Hoi Yi; Li, Ho Wa; Tsang, Sai‐Wing; Xin, Hao; So, Shu Kong

doi:10.1002/solr.201700239

Cited by 49 publications

(30 citation statements)

References 33 publications

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“…The ratio µ e / µ h of BHJ coated on WO x , WO x :PEDOT:PSS, and PEDOT:PSS HTLs are 0.59, 0.88, and 1.17, respectively. As described by previous reports, balanced µ e and µ h are helpful to improve FF of OSC devices . As the WO x :PEDOT:PSS and PEDOT:PSS HTLs show similar charge extraction properties and similar R S , the ratio µ e / µ h tends to play a larger role in the FF of OSCs.…”

Section: Summary Of Parameters Htls Involved In This Workmentioning

confidence: 55%

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

et al. 2018

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With rapid development for tens of years, organic solar cells (OSCs) have attracted much attention for their potential in practical applications. As an important photovoltaic parameter, the fill factor (FF) of OSCs stands for the effectiveness of charge generation and collection, which significantly depends on the properties of the interlayer and active layer. Here, a facile and effective strategy to improve the FF through hole-transporting layer (HTL) modification is demonstrated. By mixing WO nanoparticles with a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) emulsion, the surface free energy of the HTL is improved and the morphology of the active layer is optimized. Benefiting from increased carrier lifetime, a device based on WO :PEDOT:PSS HTL exhibits a boosted performance with an FF of 80.79% and power conversion efficiency of 14.57% PCE. The results are certified by the National Institute of Metrology (NIM), which, to date, are the highest values in this field with certification. This work offers a simple and viable option of HTL modification to realize highly efficient OSCs.

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Section: Summary Of Parameters Htls Involved In This Workmentioning

confidence: 55%

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

et al. 2018

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“…Constructing unique heterostructures to create diverse interface effects offers unprecedented opportunities in various fields, such as solar cells, photocatalysis and electrocatalysis [19][20][21][22][23][24][25][26][27]. The heterointerfaces deriving from coupling nanostructures with different properties can greatly accelerate charge transport and improve reaction kinetics [28].…”

Section: Introductionmentioning

confidence: 99%

Boosting Sodium Storage of Fe1−xS/MoS2 Composite via Heterointerface Engineering

Chen

Huang

et al. 2019

Nano-Micro Lett.

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Improving the cycling stability of metal sulfide-based anode materials at high rate is of great significance for advanced sodium ion batteries. However, the sluggish reaction kinetics is a big obstacle for the development of high-performance sodium storage electrodes. Herein, we have rationally engineered the heterointerface by designing the Fe1−xS/MoS2 heterostructure with abundant “ion reservoir” to endow the electrode with excellent cycling stability and rate capability, which is proved by a series of in and ex situ electrochemical investigations. Density functional theory calculations further reveal that the heterointerface greatly decreases sodium ion diffusion barrier and facilitates charge-transfer kinetics. Our present findings not only provide a deep analysis on the correlation between the structure and performance, but also draw inspiration for rational heterointerface engineering toward the next-generation high-performance energy storage devices.

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“…Additionally, OSCs show photovoltaic properties via the process of charge disassociation and charge transport . Due to the limitation of the optical properties of organic donors and acceptors, carrier mobility and carrier balance are critical factors that determine the performance of OSCs …”

Section: Introductionmentioning

confidence: 99%

Vertical Phase Separation for Highly Efficient Organic Solar Cells Incorporating Conjugated‐Polyelectrolytes

Han

Choi

Lee

et al. 2018

Adv Materials Inter

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OSCs can be applied to various fields due to their many advantages, such as high performance, low cost, flexibility, and potential for modulation. Recently, the research on OSCs has been focused on materials with high-performance organic donors and acceptors (fullerene and nonfullerene) and device structure research, such as ternary structure and tandem structure. These studies have contributed to developing high-performance OSCs with excellent power conversion efficiency (PCE) over 14% in single cells and 17.3% in tandem structure cells. [1][2][3][4][5][6][7][8][9][10] OSCs are based on an active layer that has a bulk-heterojunction (BHJ) structure that consists of an organic donor and acceptor, and OSCs generate excitons within the range of their optical properties. Additionally, OSCs show photovoltaic properties via the process of charge disassociation and charge transport. [11,12] Due to the limitation of the optical properties of organic donors and acceptors, carrier mobility and carrier balance are critical factors that determine the performance of OSCs. [13][14][15][16] Therefore, photogenerated carriers that have been generated in a BHJ have the disadvantage of exhibiting a lower mobility compared with inorganic semiconductor-based solar cells because of the organic semiconductor's inherent properties, such as monomolecular recombination and bimolecular recombination. [17][18][19] Additionally, certain of these photogenerated carriers return to the ground state through monomolecular trap-assisted recombination, [20][21][22] interfacial recombination, [23][24][25] and surface trap-assisted recombination, [26] and the carriers subsequently weaken the device performance because the reduction of current and internal potential occurs via a nonradiative relaxation process. [27,28] Therefore, it is necessary to enhance the carrier transport properties to improve the performance of OSCs.Recent research has reported important device structure modifications to improve the carrier transport properties of OSCs. Specifically, the carrier mobility can be increased by introducing a buffer layer through enhancing carrier transport, and the device performance can be enhanced by reducing the recombination. Hybrid organic solar cells are made through a simple one-pot coating process with conjugated polyelectrolytes (CPEs), poly[9,9-bis(4′sulfonatobutyl)fluorenealt-thiophene-doped (PFT-D). The hybrid active layer incorporated with PFT-D shows vertical phase separation by selfassembled properties of PFT-D, which result from a molecular dipole between the conjugated backbone and the side chain. The hybrid activelayer with PFT-D shows that homogeneous morphology, surface potential properties, and hydrophobic surface properties favor for enhancing photovoltaic performance. These results are identified by contact angle characteristics, X-ray photoelectron spectroscopy (XPS) profiling, and X-ray diffraction (XRD), atomic force measurement (AFM), and electrostatic force measurement (EFM) analyses. With fullerene based hybrid active...

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Balanced Electric Field Dependent Mobilities: A Key to Access High Fill Factors in Organic Bulk Heterojunction Solar Cells

Cited by 49 publications

References 33 publications

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

A Highly Efficient Non‐Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine‐Tuned Hole‐Transporting Layer

Boosting Sodium Storage of Fe1−xS/MoS2 Composite via Heterointerface Engineering

Vertical Phase Separation for Highly Efficient Organic Solar Cells Incorporating Conjugated‐Polyelectrolytes

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