Efficient device engineering for inverted non-fullerene organic solar cells with low energy loss

Xiao, Jingyang; Chen, Ziming; Zhang, Guichuan; Li, Qing-Ya; Yin, Qingwu; Jiang, Xiaofang; Huang, Fei; Xu, Yun‐Xiang; Yip, Hin‐Lap; Cao, Yong

doi:10.1039/c8tc00705e

Cited by 40 publications

(19 citation statements)

References 68 publications

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“…More importantly, by incorporating 3% N2200 into FOIC, the slope is the lowest, for which we have realized the highest FF in PTB7‐Th/FOIC+N2200+DIO devices. Furthermore, electron mobility ( µ e ) and hole mobility ( µ h ) were measured by using the space‐charge‐limited current (SCLC) method on the basis of the Mott–Gurney equation . The mobility measurements are shown in Figure f; Figure S1, Supporting Information, with specific values summarized in Table S4, Supporting Information.…”

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

confidence: 99%

“…The 2D GIWAXS patterns and corresponding line profiles are depicted in Figure 3 ; Figure S2 and S3, Supporting Information. The crystallization coherence length (CCL) was quantified using Scherrer equation . The pure FOIC film exhibits highly ordered lamellar stacking (100) peak at low q ( q = 0.45 Å) in in‐plane direction.…”

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

confidence: 99%

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

confidence: 99%

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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“…It is widely accepted that in a semilogarithmic plot of V OC versus light intensity, the first‐order recombination can be extracted from the slope of 2 kT q −1 , while a slope in the order of kT q −1 is associated with the second‐order recombination. Conversely, in the case of the double logarithmic plot of J SC versus light intensity, the dependence of the J SC on the light intensity is described by the expression J SC ∝ I α , where α is considered to be unity if there is negligible second‐order recombination in the device . It is apparent that the slope in the V OC plot of the PCE10:EH‐IDT device stays close to kT q −1 regardless of light exposure time, and the value of α in the J SC plot remains almost at unity, thus indicating that neither first‐ nor second‐order recombination becomes pronounced in the PCE10:EH‐IDT device during the photoaging test.…”

Section: Resultsmentioning

confidence: 99%

An Operando Study on the Photostability of Nonfullerene Organic Solar Cells

et al. 2019

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Nonfullerene organic solar cells (OSCs) have achieved an impressive power conversion efficiency (PCE) over the past few years, showing a great potential for real applications. However, the study on the photostability and degradation mechanism of nonfullerene OSCs is far behind than that of fullerene‐based solar cells, which is crucial for the commercial applications of the technology. Herein, an efficient and stable nonfullerene OSC based on PCE10:rhodanine‐benzothiadiazole‐coupled indacenodithiophene with branched 2‐ethylhexyl side chains (EH‐IDT) is fabricated from environmentally benign solvent. The PCE10:EH‐IDT solar cell shows a high PCE of 9.17% and a long operational lifetime (T80) of 2132 h, compared with other two OSCs based on 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone)‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2’,3’‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]‐dithiophene (ITIC) and another fuse ring acceptor with withdrawing units of 1,1‐dicyanomethylene‐3‐indanone and hexyl side chains (IDIC) nonfullerene acceptors, with tested lifetimes of only 221 and 558 h, respectively. As indicated by the Flory–Huggins interaction parameters, ITIC and IDIC have poor miscibility with PCE10, which leads to morphology degradation, suppressed charge generation, increased trap states, and charge recombination in the photoaging test, which accounts for the significant loss of short‐circuit current density and fill factor during operation. The improved miscibility of the donor and the acceptor results in a more stable morphology, and the PCE10:EH‐IDT solar cells thus achieve an outstanding overall performance that combines high efficiency and superior photostability and paves the way for the potential practical applications of OSCs.

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“…To study the effect of defect passivation on free charge carriers dynamics in the microsecond scale, the transient photovoltage (TPV) and TPC measurement were performed. [ 59,71–73 ] Figure 7 a shows the TPV of devices with different single and double ETLs. TPV can reveal information about the charge recombination rate in the device.…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Passivation of Surface Vacancies and Enhancement in Charge Transfer Property of ZnO Electron Transport Layer for Inverted Organic Solar Cells

et al. 2020

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The design and development of a charge carrier transport material are decisive parameters for controlling the organic solar cell's power conversion efficiency (PCE). ZnO is one of the most suitable electron transport materials used in inverted bulk heterojunction polymer solar cells. However, the solution‐processed ZnO has surface defects, which hinders the power conversation efficiency of the device. Herein, it is designed and demonstrated that the 2D NO2 group functionalized reduced graphene oxide (rGN) sheet coated on top of the 1D ZnO nanoridges not only passivates the surface but also enhances the charge transport property of the electron transport layer (ETL), thereby improving the overall PCE by 31%. Atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), and optical measurements reveal that the highly transparent bilayer ZnO/rGN ETL has uniform film formation and, thereby, improved ohmic contact between the cathode and the photoactive layer. Due to the improved electron transport from the photoanode (PTB7‐Th:PC71BM) to the buffer layer, a photoinduced current density of 20.05 mA cm−2 is achieved. This interface modification by rGN can be an effective strategy to passivate the surface and retards the recombination rate to enhance the efficiency of organic photovoltaic cells.

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Efficient device engineering for inverted non-fullerene organic solar cells with low energy loss

Abstract: We have systematically investigated the synergistic effect of thermal annealing and interlayer modification on improving the performance of inverted non-fullerene organic solar cells.

Cited by 40 publications

References 68 publications

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

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

An Operando Study on the Photostability of Nonfullerene Organic Solar Cells

Simultaneous Passivation of Surface Vacancies and Enhancement in Charge Transfer Property of ZnO Electron Transport Layer for Inverted Organic Solar Cells

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