Ultra-low-cost coal-based carbon electrodes with seamless interfacial contact for effective sandwich-structured perovskite solar cells

Meng, Fanning; Gao, Liguo; Yan, Yahui; Cao, Junjie; Wang, Ning; Wang, Tonghua; Ma, Tingli

doi:10.1016/j.carbon.2019.01.047

Cited by 72 publications

(52 citation statements)

References 32 publications

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“…[10c, 12, 13, 20b,23] These results support our hypothesis that the triple cation 2D perovskite films exhibit reduced nonradiative recombination and longer carrier lifetime,w hich result from the improved film quality as discussed above for the triple-cation-based 2D perovskite thin films.S imilar results were shown in the Nyquist plot from the impedance measurement (see Figure S8). [24] We conducted time-resolved microwave conductivity (TRMC) measurements [25] of the carrier mobility ( Figure 3B) to compare perovskite thin films prepared from monocations and triple cations with 640 nm laser excitation. [24] We conducted time-resolved microwave conductivity (TRMC) measurements [25] of the carrier mobility ( Figure 3B) to compare perovskite thin films prepared from monocations and triple cations with 640 nm laser excitation.…”

Section: Angewandte Chemiementioning

confidence: 99%

“…Thetransfer resistance (R tr )at high frequency (the first small arc) shows that the transfer of electrons and holes is more efficient in PSCs based on triple cations than that of monocation-based PSCs when compared under the same conditions.T he large arc at low frequency is attributed to recombination resistance (R rec ), where PSCs based on triple cations show ah igher barrier for carrier recombination. [24] We conducted time-resolved microwave conductivity (TRMC) measurements [25] of the carrier mobility ( Figure 3B) to compare perovskite thin films prepared from monocations and triple cations with 640 nm laser excitation. The yield-mobility product fSm value increased from 0.41 cm 2 V À1 s À1 for BA 2 MA 4 Pb 5 I 16 to 2.8 cm 2 V À1 s À1 for BA 2 (Cs 0.02 MA 0.64 FA 0.34 ) 4 Pb 5 I 16 .F igure 3C shows the comparison of the fSm value over aw ide range of laser excitation intensities.T his dramatic improvement of the transport property is consistent with the much-reduced dark carrier density (n d = 1.94 10 17 cm À3 )f or the BA 2 (Cs 0.02 MA 0.64 FA 0.34 ) 4 Pb 5 I 16 sample compared to the BA 2 MA 4 Pb 5 I 16 sample (n d = 2.58 10 18 cm À3 ;F igure 3D).…”

Section: Angewandte Chemiementioning

confidence: 99%

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Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells

et al. 2019

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Organic-inorganic hybrid two-dimensional (2D) perovskites (n 5) have recently attracted significant attention because of their promising stability and optoelectronic properties.N ormally,2 Dp erovskites contain am onocation [e.g., methylammonium (MA + )o rf ormamidinium (FA + )]. Reported here for the first time is the fabrication of 2D perovskites (n = 5) with mixed cations of MA + ,F A + ,a nd cesium (Cs + ). The use of these triple cations leads to the formation of as mooth, compact surface morphology with larger grain sizea nd fewer grain boundaries compared to the conventional MA-based counterpart. The resulting perovskite also exhibits longer carrier lifetime and higher conductivity in triple cation 2D perovskite solar cells (PSCs). The power conversion efficiency (PCE) of 2D PSCs with triple cations was enhanced by more than 80 %( from 7.80 to 14.23 %) compared to PSCs fabricated with amonocation. The PCE is also higher than that of PSCs based on binary cation (MA + -FA + or MA + -Cs + )2 Dstructures. Organic-inorganic lead halide perovskite solar cells (PSCs)have undergone remarkable development and have potential applications because of their unique advantages,such as high absorption coefficients,e xcellent carrier transport, low cost, and tunable compositions,t hereby allowing easy fabrication by various processes. [1] Recent effort has resulted in aP CS with certified power conversion efficiency(PCE) of 24.2 %. [2] However,the issue associated with long-term stability against moisture,heat, and light is still achallenge,hindering the use [*] Dr.

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Section: Angewandte Chemiementioning

confidence: 99%

Section: Angewandte Chemiementioning

confidence: 99%

Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells

et al. 2019

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“…However, some important obstacles could limit their commercialization . Hole transport materials and back‐electrode materials used in research laboratories are often too expensive, which need to be replaced by low‐cost, abundant, and possibly environmentally sustainable alternatives . Efficiency loss is also inevitable when the solar cell or module area increases, although remarkable progress with large‐scale PSCs manufacturing techniques have been demonstrated .…”

Section: Introductionmentioning

confidence: 99%

Improving Charge Transport via Intermediate‐Controlled Crystal Growth in 2D Perovskite Solar Cells

Gao

Wang

Xiao

et al. 2019

Adv Funct Materials

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116

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Reduced-dimensional hybrid perovskite semiconductors have recently attracted significant attention due to their promising stability and optoelectronic properties. However, the issue of poor charge transport in 2D perovskites limits its application. Here, studies on intermediatecontrolled crystal growth are reported to improve charge carrier transport in 2D perovskite thin films. It is shown that the coordination strength of solvents with perovskite precursor affects the initial state of intermediate phase formation as well as the subsequent perovskite layer growth. Tuning the solvent composition with a mixture (5:5) of dimethyl formamide (DMF) and dimethyl sulfoxide (DMSO) leads to the growth of highly orientated 2D perovskite films with much-improved optoelectronic properties (faster transport by ≈50x, longer carrier lifetime by ≈4x, and lower defect density by ≈30x) than the film prepared with pure DMF. Consequently, perovskite solar cells based on DMF/DMSO (5:5) show >80% efficiency improvement than the devices based on pure DMF.

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“…Further, the sample EC-GC10 annealed at the temperature of ~1000 °C, displays three dominant diffraction peaks at 2θ = 22.27°, 33.91° and 47.67° which corresponds to the reflections from (002), (100) and (110) planes respectively. In this, the intensity of the graphitic plane (002) is more when compared to that of the EC-GC8 sample and a shift in the 2θ value from 26.50° to 33.91° of the (100) plane is observed, signifying the improved crystallization of the graphitic phase 36,37 . The increase in the peak intensity reveals that the samples EC-GC8 and EC-GC10 annealed at ~850 °C and ~1000 °C achieved a better crystalline nature than the sample EC-GC4 prepared at ~450 °C.…”

Section: Resultsmentioning

confidence: 80%

Perovskite Solar Cells: A Porous Graphitic Carbon based Hole Transporter/Counter Electrode Material Extracted from an Invasive Plant Species Eichhornia Crassipes

Pitchaiya

Eswaramoorthy

Muthukumarasamy³

et al. 2020

Sci Rep

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perovskite solar cells (pScs) composed of organic polymer-based hole-transporting materials (HtMs) are considered to be an important strategy in improving the device performance, to compete with conventional solar cells. Yet the use of such expensive and unstable HTMs, together with hygroscopic perovskite structure remains a concern -an arguable aspect for the prospect of onsite photovoltaic (PV) application. Herein, we have demonstrated the sustainable fabrication of efficient and air-stable PSCs composed of an invasive plant (Eichhornia crassipes) extracted porous graphitic carbon (ec-Gc) which plays a dual role as HTM/counter electrode. The changes in annealing temperature (~450 °C, ~850 °C and ~1000 °C) while extracting the EC-GC, made a significant impact on the degree of graphitization -a remarkable criterion in determining the device performance. Hence, the fabricated champion device-1 c : Glass/fto/c-tio 2 /mp-tio 2 /cH 3 nH 3 pbi 3−x cl x /EC-GC10@CH 3 nH 3 pbi 3−x cl x /EC-GC10) exhibited a PCE of 8.52%. Surprisingly, the introduced EC-GC10 encapsulated perovskite interfacial layer at the perovskite/HtM interface helps in overcoming the moisture degradation of the hygroscopic perovskite layer in which the same champion device-1 c evinced better air stability retaining its efficiency ~94.40% for 1000 hours. We believe that this present work on invasive plant extracted carbon playing a dual role, together as an interfacial layer may pave the way towards a reliable perovskite photovoltaic device at low-cost.Lower cost, shorter payback time and an unprecedented rise in power conversion efficiency (PCE) escalating from 3.8% in 2009 to 24.2% (2019) have turned the attention of researchers and industrial community towards perovskite solar cells (PSCs) within a decade 1-5 . Outstanding photovoltaic properties such as high charge carrier mobility, long electron-hole diffusion length, high absorption coefficient with tuneable bandgap property, low-exciton binding energy, and easy solution preparation techniques make it to compete with traditional commercial silicon solar cells 6,7 . In general, a typical PSC is composed of an electron transport layer (ETL), an active absorbing layer, a HTL, and a counter electrode. Nevertheless, the use of expensive and unstable conducting polymers based hole transporting materials (HTMs) such as (2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9

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Ultra-low-cost coal-based carbon electrodes with seamless interfacial contact for effective sandwich-structured perovskite solar cells

Cited by 72 publications

References 32 publications

Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells

Enhanced Charge Transport by Incorporating Formamidinium and Cesium Cations into Two‐Dimensional Perovskite Solar Cells

Improving Charge Transport via Intermediate‐Controlled Crystal Growth in 2D Perovskite Solar Cells

Perovskite Solar Cells: A Porous Graphitic Carbon based Hole Transporter/Counter Electrode Material Extracted from an Invasive Plant Species Eichhornia Crassipes

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