Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells

Bi, Pengqing; Tong, Xiao; Yang, Xiaoyu; Niu, Meng-Si; Wen, Zhenchuan; Zhang, Kangning; Qin, Wei; So, Shu Kong; Lu, Guanghao; Xin, Hao; Liu, Hong

doi:10.1016/j.nanoen.2018.01.040

Cited by 128 publications

(100 citation statements)

References 56 publications

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“…It is well known that the more ordered face‐on molecular arrangement and tightly packed π–π stacking should be beneficial to charge transport along the normal direction of the substrate. [ 39–41 ] It is highlighted that MF1 should prefer to well‐mix with IPTBO‐4Cl rather than form individual domains due to the absence of (100) diffraction peak of MF1 in IP direction in the optimized ternary blend films.…”

Section: Resultsmentioning

confidence: 99%

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Yang

Gao

et al. 2020

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Efficient organic solar cells (OSCs) are fabricated using polymer PM6 as donor, and IPTBO‐4Cl and MF1 as acceptors. The power conversion efficiency (PCE) of IPTBO‐4Cl based and MF1 based binary OSCs individually arrive to 14.94% and 12.07%, exhibiting markedly different short circuit current density (JSC) of 23.18 mA cm−2 versus 17.01 mA cm−2, fill factor (FF) of 72.17% versus 78.18% and similar open circuit voltage (VOC) of 0.893 V versus 0.908 V. The two acceptors, IPTBO‐4Cl and MF1, have similar lowest unoccupied molecular orbital levels, which is beneficial for efficient electron transport in the ternary active layer. The PCE of optimized ternary OSCs arrives to 15.74% by incorporating 30 wt% MF1 in acceptors, resulting from the simultaneously increased JSC of 23.20 mA cm−2, VOC of 0.897 V, and FF of 75.64% in comparison with IPTBO‐4Cl based binary OSCs. The gradually increased FFs of ternary OSCs indicate the well‐optimized phase separation and molecular arrangement with MF1 as morphology regulator. This work may provide a new viewpoint for selecting an appropriate third component to achieve efficient ternary OSCs from materials and photovoltaic parameters of two binary OSCs.

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Section: Resultsmentioning

confidence: 99%

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Yang

Gao

et al. 2020

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“…As expected, the increased crystallization of FOIC is mainly due to the formation of the more desired vertical phase distribution, leading to purer phases of FOIC, which is in good agreement with the thickness‐dependent vertical phase distribution analysis. SBC‐processed OSCs has proved to be an efficient strategy to optimize the vertical phase distribution, testing by the film‐depth‐dependent light absorption (Figure S6b, Supporting Information). Furthermore, we analyzed the orientation distribution of the (100) peak, the polar angle, ω, is defined as the angle between the scattering vector and the substrate normal.…”

Section: Detailed Photovoltaic Parameters Of Blade‐coated Oscs Under mentioning

confidence: 99%

Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Wang

Zhu

Naveed

et al. 2020

Advanced Energy Materials

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As a predominant fabrication method of organic solar cells (OSCs), casting of a bulk heterojunction (BHJ) structure presents overwhelming advantages for achieving higher power conversion efficiency (PCE). However, long‐term stability and mechanical strength are significantly crucial to realize large‐area and flexible devices. Here, controlling blend film morphology is considered as an effective way toward co‐optimizing device performance, stability, and mechanical properties. A PCE of 12.27% for a P‐i‐N‐structured OSC processed by sequential blade casting (SBC) is reported. The device not only outperforms the as‐cast BHJ devices (11.01%), but also shows impressive stability and mechanical properties. The authors corroborate such enhancements with improved vertical phase separation and purer phases toward more efficient transport and collection of charges. Moreover, adaptation of SBC strategy here will result in thermodynamically favorable nanostructures toward more stable film morphology, and thus improving the stability and mechanical properties of the devices. Such co‐optimization of OSCs will pave ways toward realizing the highly efficient, large‐area, flexible devices for future endeavors.

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“…The strategy of incorporating the third component in OSC is a simple and efficient way to achieve the device performance that is more tolerant of thickness variation compared with binary device . These ternary OSCs generally possess the effective dissociation of exciton, faster transport of charge, and less recombination, which are important for the improvement of FF and PCE . However, the third component is commonly polymer or small molecular material with high‐cost or synthetic complexity.…”

Section: Introductionmentioning

confidence: 99%

Effective Exciton Dissociation and Reduced Charge Recombination in Thick‐Film Organic Solar Cells via Incorporation of Insulating Polypropylene

Wang

Yang

et al. 2019

Solar RRL

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In organic solar cells (OSCs), the sensitivity of device performance to active layer thickness is a limiting factor for the large‐scale manufacture and roll‐to‐roll production. To reduce the thickness‐dependent effects, a low‐cost insulating polypropylene (PP) material is incorporated into the system with a high crystallinity donor, poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione))]:[6,6]‐phenyl C71 butyric acid methyl ester (PBDB‐T:PC71BM) and the system with a low crystallinity donor, poly[[4,8‐bis[(2ethylhexyl)oxy]‐benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl][3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl]thieno‐[3,4b]thiophenediyl] (PTB7):PC71BM. The devices based on PBDB‐T:PC71BM:PP (2 wt%) show a power conversion efficiency (PCE) of 7.6% at a thickness of 280 nm compared with the control device with a PCE of 7% at a thickness of 100 nm. The change is mainly due to the enhancement of the crystallinity of donors with high crystallinity. PTB7:PC71BM with 4 wt% PP shows higher PCE than the control device for the same thickness (100–300 nm) and reduced PCE with increasing thickness. These are mainly due to the reduced PC71BM aggregation. The optimization of crystallinity and morphology will further promote effective exciton dissociation, accelerated charge transport, and reduced charge recombination. It indicates that the low cost and simple method of adding PP is a promising option for roll‐to‐roll production in the future.

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Regulating the vertical phase distribution by fullerene-derivative in high performance ternary organic solar cells

Cited by 128 publications

References 56 publications

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Over 15.7% Efficiency of Ternary Organic Solar Cells by Employing Two Compatible Acceptors with Similar LUMO Levels

Sequential Blade‐Coated Acceptor and Donor Enables Simultaneous Enhancement of Efficiency, Stability, and Mechanical Properties for Organic Solar Cells

Effective Exciton Dissociation and Reduced Charge Recombination in Thick‐Film Organic Solar Cells via Incorporation of Insulating Polypropylene

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