High-efficiency small-molecule ternary solar cells with a hierarchical morphology enabled by synergizing fullerene and non-fullerene acceptors

Zhou, Zichun; Xu, Shengjie; Song, Jingnan; Jin, Yingzhi; Yue, Qihui; Qian, Yongxian; Liu, Feng; Zhang, Fengling; Zhu, Xiaozhang

doi:10.1038/s41560-018-0234-9

Cited by 574 publications

(430 citation statements)

References 48 publications

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“…[4][5][6] Benefiting from the great efforts devoted to the design of new materials, [7][8][9][10][11][12][13] optimization of the blend morphology, [14][15][16][17][18] understanding the charge generation mechanism, [19][20][21][22][23][24][25][26] significant progress has been achieved in the last few years. [4][5][6] Benefiting from the great efforts devoted to the design of new materials, [7][8][9][10][11][12][13] optimization of the blend morphology, [14][15][16][17][18] understanding the charge generation mechanism, [19][20][21][22][23][24][25][26] significant progress has been achieved in the last few years.…”

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confidence: 99%

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

et al. 2019

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inorganic photovoltaic cells based on crystal-silicon, the solution processability of OPV cells makes it suitable for the largescale solution production at room temperature via the roll-to-roll method, which promises low-cost and large area device fabrication onto flexible substrates. [4][5][6] Benefiting from the great efforts devoted to the design of new materials, [7][8][9][10][11][12][13] optimization of the blend morphology, [14][15][16][17][18] understanding the charge generation mechanism, [19][20][21][22][23][24][25][26] significant progress has been achieved in the last few years. Recently, the power conversion efficiencies (PCEs) of OPV cells have surpassed ≈15%. [27][28][29] However, the devices with cutting-edge performance are fabricated using highly toxic solvents like chlorinated and/or aromatic solvents, which is not adaptable for large-scale production and becoming a severe problem that hinders the mass production of the OPV cells. Therefore, the material design of OPV materials should take both the efficiency and processability into consideration.At present, the commonly used processing solvents for high-performance OPV materials are chlorobenzene (CB) and chloroform (CF), as they possess excellent dissolving capability of the highly conjugated structures. [30][31][32] Over the last few years, the design and application of nonfullerene acceptors (NFAs) have achieved Recent advances in nonfullerene acceptors (NFAs) have enabled the rapid increase in power conversion efficiencies (PCEs) of organic photovoltaic (OPV) cells. However, this progress is achieved using highly toxic solvents, which are not suitable for the scalable large-area processing method, becoming one of the biggest factors hindering the mass production and commercial applications of OPVs. Therefore, it is of great importance to get good eco-compatible processability when designing efficient OPV materials. Here, to achieve high efficiency and good processability of the NFAs in eco-compatible solvents, the flexible alkyl chains of the highly efficient NFA BTP-4F-8 (also known as Y6) are modified and BTP-4F-12 is synthesized. Combining with the polymer donor PBDB-TF, BTP-4F-12 shows the best PCE of 16.4%. Importantly, when the polymer donor PBDB-TF is replaced by T1 with better solubility, various eco-compatible solvents can be applied to fabricate OPV cells. Finally, over 14% efficiency is obtained with tetrahydrofuran (THF) as the processing solvent for 1.07 cm 2 OPV cells by the blade-coating method. These results indicate that the simple modification of the side chain can be used to tune the processability of active layer materials and thus make it more applicable for the mass production with environmentally benign solvents. Organic PhotovoltaicsOrganic photovoltaic (OPV) cells consisting of organic layers as photoactive materials are one of the most promising next-generation photovoltaic technologies to harvest clean and renewable solar energy. [1][2][3] When compared with the conventional

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confidence: 99%

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

et al. 2019

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“…[43][44][45] The Nyquist plots weremeasured under 1sun illuminationwith an applied bias voltage of 0.8 Vint he frequency range from 2MHz to 0.5 Hz. [39,47] In the presentc ase, the device without t-BAI doping exhibits as lope of 1.87 kT/q, [48,49] indicating as trong energy loss owing to trap-assisted recombination. In the plots, the low-frequency one relatest ot he recombination resistance (R rec )a tt he interface of the perovskite/charget ransport layer (CTL), the high-frequency one concerns the charge-transfer resistance( R ct )f rom perovskite to CTL, and R s is the sheet resistance of the conductive electrode.…”

Section: Resultsmentioning

confidence: 57%

Fabrication of Efficient and Stable Perovskite Solar Cells in High‐Humidity Environment through Trace‐Doping of Large‐Sized Cations

Liu

Wang

et al. 2019

ChemSusChem

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Solution‐processed organic–inorganic lead halide perovskites have shown photovoltaic performance above 23 %, attracting great attention. However, the champion devices require fabrication in a controlled inert/dry atmosphere. The development of highly efficient and stable perovskite solar cells under high‐humidity atmosphere conditions for future commercialization is still challenging, especially for CH3NH3PbI3 (MAPbI3), which is vulnerable to moisture. In this study, a large‐sized tert‐butylammonium [C(CH3)3NH3+] organic cation was incorporated into the MAPbI3 crystalline structure, which could form a more stable 3 D crystalline structure and alleviate the decomposition caused by the humidity. It delivered a power conversion efficiency of 19.3 % upon preparation under a humid environment condition of 50 % relative humidity as well as improved humidity and thermal stability. Our work provides a facile strategy for improving perovskite performance and stability by introducing a new chemical additive for the future application of perovskite solar cells.

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“…[46][47][48] The J-V curves of all OPVs under light intensity (P L ) varied from 2.5 to 100 mW cm −2 were measured to investigate charge dynamic process in active layers, as shown in Figure S2. Under short-circuit conditions, the J SC s of OPVs with different UD-SVA treatment are much higher than those of as-cast OPVs, which should be benefited from the efficient exciton separation and charge collection efficiency in OPVs with UD-SVA treatment.…”

Section: Resultsmentioning

confidence: 99%

Nonfullerene organic photovoltaic cells exhibiting 13.76% efficiency by employing upside‐down solvent vapor annealing

Jiao

Pang

2019

Int J Energy Res

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Summary Organic photovoltaic cells (OPVs) are fabricated with a polymer donor PM7 and a nonfullerene acceptor IT‐4Cl; the morphology of active layers is optimized by employing upside‐down solvent vapor annealing (UD‐SVA) method with different annealing solvents. The OPVs with CS2 as annealing solvent exhibit optimized power conversion efficiency (PCE) of 13.76%, with simultaneously increased short‐circuit current density (JSC) of 20.53 mA cm−2 and fill factor (FF) of 77.05%. More than 15% PCE improvement can be achieved by employing CS2 UD‐SVA treatment, which should be attributed to slightly enhanced photon harvesting, efficient exciton separation, charge transport, and collection, resulting from the well‐developed morphology of active layer. Moreover, the PM7:IT‐4Cl–based OPVs with CS2 as annealing solvent still can maintain PCE more than 13% in a wide treatment time range from 20 to 90 seconds. This work demonstrated that UD‐SVA has great potential in improving the performance of nonfullerene OPVs.

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High-efficiency small-molecule ternary solar cells with a hierarchical morphology enabled by synergizing fullerene and non-fullerene acceptors

Cited by 574 publications

References 48 publications

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

Eco‐Compatible Solvent‐Processed Organic Photovoltaic Cells with Over 16% Efficiency

Fabrication of Efficient and Stable Perovskite Solar Cells in High‐Humidity Environment through Trace‐Doping of Large‐Sized Cations

Nonfullerene organic photovoltaic cells exhibiting 13.76% efficiency by employing upside‐down solvent vapor annealing

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