High‐Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor

Wan, Ji; Zhang, Lifu; He, Qi‐Chang; Liu, Siqi; Huang, Bin; Hu, Lei; Zhou, Weihua; Chen, Yiwang

doi:10.1002/adfm.201909760

Cited by 93 publications

(82 citation statements)

References 54 publications

(81 reference statements)

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“…Spin coating is the most representative method employed to form constituent layers in an OPV device, including the photoactive layers, [67][68][69] hole-and electron-transport layers, and the electrodes. [70,71] In detail, the spin coating process involves four steps: i) solution casting onto the substrate; ii) solution thinning by radially outward flow due to centrifugal force; iii) ejection of the solution from the perimeter of the substrate; and iv) further thinning and drying of the film by solvent evaporation.…”

Section: Opvs Produced By Spin Coatingmentioning

confidence: 99%

Progress in Materials, Solution Processes, and Long‐Term Stability for Large‐Area Organic Photovoltaics

et al. 2020

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processing at low cost compared with their inorganic counterparts. The first breakthrough in OPV technology was achieved by realizing BHJ active layers with nanoscale bicontinuous network structures of electron donor (D) and acceptor (A) materials; this structure enables efficient exciton separation at the D-A interface. [1] The development of push-pull-type donor polymers has effectively extended the light absorption range of OPVs into the near-infrared (NIR) region, which has ultimately led to substantial improvements in power conversion efficiency (PCE) to greater than 10%. In particular, highly crystalline donor polymers such as PffBT4T-2OD substantially improved charge-transport properties, enabling OPV devices with a BHJ film thickness greater than 200 nm to operate. [2] Historically, fullerene derivatives have been dominantly used as acceptors in OPVs because of their excellent electron-accepting and transporting properties and because they can be prepared with a morphology optimized for efficient charge-carrier generation and transport. [3,4] However, despite such promising characteristics, OPVs based on fullerene derivatives have drawbacks of limited light-absorption properties, poor energylevel tunability, and poor morphological and/or photochemical stability. [5,6] Over the past several years, tremendous efforts have been directed toward the development of nonfullerenebased OPVs to overcome these limitations. The advantages of nonfullerene acceptors over fullerenes include easily tunable energy levels, which enables OPVs to achieve substantially higher open-circuit voltages (V OC s) than conventional fullerenebased devices. [7] In addition, nonfullerene acceptors enable better light absorption properties and therefore generate higher photocurrents than fullerene derivatives. [8] Furthermore, nonfullerene acceptors with appropriate molecular tailoring can provide chemically stable photoactive materials, potentially enhancing long-term device stability. [5] Recent breakthroughs realized through the development of small molecular nonfullerene acceptors have resulted in remarkable enhancements in the PCEs of single-junction OPVs to greater than 17%, which demonstrates the potential for the large-scale manufacture of OPVs. [9] When translating photovoltaic technology from laboratory to commercial products, low cost, high PCE, and high Organic solar cells based on bulk heterojunctions (BHJs) are attractive energy-conversion devices that can generate electricity from absorbed sunlight by dissociating excitons and collecting charge carriers. Recent breakthroughs attained by development of nonfullerene acceptors result in significant enhancement in power conversion efficiency (PCEs) exceeding 17%. However, most of researches have focused on pursuing high efficiency of small-area (<1 cm 2) unit cells fabricated usually with spin coating. For practical application of organic photovoltaics (OPVs) from lab-scale unit cells to industrial products, it is essential to develop efficient technologies that can extend act...

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Section: Opvs Produced By Spin Coatingmentioning

confidence: 99%

Progress in Materials, Solution Processes, and Long‐Term Stability for Large‐Area Organic Photovoltaics

et al. 2020

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“…[ 119–122 ] Incorporating appropriate third component into binary host system, the PCE of ternary OSCs can be increased by more than 10% due to various factors such as alignment of the cascade energy level, the formation of alloys, optimized morphology, and increased charge mobility. [ 123–126 ] The ternary strategy may have a positive effect on the performance improvement of thick‐film OSCs. In this part, we summarize the recent progress of efficient ternary thick‐film OSCs, which can be classified into three categories of two donors with one NFA, one donor with one NFA and one FA, as well as one donor with two NFAs.…”

Section: Categories Of Efficient Thick‐film Oscsmentioning

confidence: 99%

A Critical Review on Efficient Thick‐Film Organic Solar Cells

Gao

Wang

et al. 2020

Solar RRL

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To date, the power conversion efficiency (PCE) of lab‐scale organic solar cells (OSCs) has exceeded 17%, which heralds the bright future for commercial applications of OSCs. High‐performance OSCs with thick active layers are essential for large‐scale production. First, the relatively thick active layers should be more compatible with the roll‐to‐roll (R2R) large‐area processing, which is conducive to forming uniform and defect‐free active layers in the process of high‐speed, mass production. Second, the thick active layers can absorb more incident light in their spectral range, which helps thick‐film OSCs to obtain relatively high short‐circuit current density (JSC). So far, relatively little attention has been paid to thick‐film OSCs, and the PCE of thick‐film OSCs lags far behind its thin‐film analogues. Herein, the recent development of thick‐film OSCs is highlighted and the critical limit factors on the PCE of thick‐film OSCs are pointed out. Some strategies are highlighted to improve the efficiency of thick‐film OSCs. This review study will be helpful to the researchers engaging in the development of efficient thick‐film OSCs.

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“…[8,9] Moreover, if the third component is introduced to improve the performance of devices, or OSCs are fabricated on a large scale, the problem of the uncontrollable morphology of BHJ will be aggravated. [10][11][12] Compared with BHJ, the LbL solution processing method with many advantages is a cost-effective alternative way. [13][14][15][16] Firstly, good contact between the material and the corresponding electrodes can be ensured by sequentially spin coating materials.…”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Solution Processing Method for Organic Solar Cells

Zhao

et al. 2020

Solar RRL

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Organic solar cells (OSCs) have attracted wide attention due to their economy, environmental protection, and potential for large-scale commercial production. The layer-by-layer (LbL) solution processing method, where donor solution and acceptor solution are coated sequentially, is a simple and effective way to fabricate OSCs, achieving a high power conversion efficiency (PCE) of up to 17%. Compared with bulk-heterojunction (BHJ) OSCs, LbL solution-processed OSCs separately adjust different layers, making the components distribute ideally in the vertical direction that is beneficial for exciton dissociation, charge transport, and charge collection. Moreover, the LbL approach has better potential in the preparation of large-area devices, which is a key link in the commercialization of OSCs. Herein, the basic principles and the latest research progress of LbL solution-processed OSCs are summarized, and the existing challenges and prospects of the LbL solution processing method in industrial production are discussed.

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High‐Performance Pseudoplanar Heterojunction Ternary Organic Solar Cells with Nonfullerene Alloyed Acceptor

Cited by 93 publications

References 54 publications

Progress in Materials, Solution Processes, and Long‐Term Stability for Large‐Area Organic Photovoltaics

Progress in Materials, Solution Processes, and Long‐Term Stability for Large‐Area Organic Photovoltaics

A Critical Review on Efficient Thick‐Film Organic Solar Cells

Layer‐by‐Layer Solution Processing Method for Organic Solar Cells

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