PCBM-blended chlorobenzene hybrid anti-solvent engineering for efficient planar perovskite solar cells

Yoon, Suk-Young; Ha, Min−Woo; Kang, Dong‐Won

doi:10.1039/c7tc02193c

Cited by 20 publications

(12 citation statements)

References 38 publications

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“…The effect of PCBM-like derivatives-containing anti-solvent treatment can be ascribed to being occupied of vacancies/pinholes by PCBM molecules, indicating ac ompact/dense and highly smooth perovskite surface. [20] The enhancement of surface morphology was further supported by the contact angle measurements between corresponding perovskite films and water molecules (inset of Figure S10a-d). The only CB containing perovskite film exhibited a4 8 8,w hile, 3, 4,a nd 3 + 4 antisolvents treated perovskite films exposed ap revailing hydro-phobicity of 63-658,l eading to al ong-term tolerance humidity of the device by prohibiting the water ingression into the perovskite film.…”

mentioning

confidence: 71%

Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells

Vidal

Izquierdo

Filippone

et al. 2019

Chemistry A European J

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We report on the site-selective synthesis of PCBM-like [70]fullerenes ite-isomers, where the elusive bsite-isomers are, for the first time, the major product in a (cyclo)addition chemical reactioni nvolving [70]fullerene. The reaction involves an straightforward cyclopropanation of [70]fullerenef rom sulfoniums alts, affordingamixture of a and b site-isomers in good yields. Amazingly,t he preference for the a-o rb-site-isomer can be efficiently controlled by means of the solventp olarity!D FT theoretical calculations( DMF and toluene) nicely predict that, although the formation of the a-adduct is, as expected, thermodynamically favored, the selectivity of the process is determined by the energy difference of the respective transition states. Furthermore, the employ of a or/and b site-isomers, as pure materials or as am ixture of them, used as templating agent,h as been evaluated in perovskite solar cells. The positive influence of the [70]fullerenes by passivating the voids/pin-holes and/or deep slits, is reflected in highly efficient and stable bulk heterojunction perovskite solar cells, whose performance (around 20 %) is slightly but consistently dependingo nt he isomeric fullerene composition. These experimentalf indings pave the way to investigate an ew reactivity on C 70 and to explore the properties of the less-known b-derivatives.

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confidence: 71%

Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells

Vidal

Izquierdo

Filippone

et al. 2019

Chemistry A European J

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“…It can remove the residual solvents of DMF rapidly, and boost the nucleation of the perovskite, which subsequently promotes the crystallization of the perovskite film [15]. Up to now, diethyl ether, chlorobenzene, and ethyl acetate (EA) have been selected as antisolvents in the literature [16,17,18]. Grätzel group employed a simple vacuum-flash solution processing method, and obtained shiny, smooth, and crystalline perovskite films and meso-structured TiO 2 /perovskite solar cells with a PCE of 19.6% [19].…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient and Stable MAPbI3 Perovskite Solar Cell Induced by Regulated Nucleation and Ostwald Recrystallization

Huang

Wang

et al. 2018

Materials

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Perovskite solar cells have attracted great attention in recent years, due to their high conversion efficiency and solution-processable fabrication. However, most of the solar cells with high efficiency in the literature are prepared employing TiO2 as electron transport material, which needs sintering at a temperature higher than 450 °C, and is not applicable to flexible device and low-cost fabrication. Herein, the MAPbI3 perovskite solar cells are fabricated at a low temperature of 150 °C with SnO2 as the electron transport layer. By dropping the antisolvent of ethyl acetate onto the perovskite precursor films during the spin coating process, compact MAPbI3 films without pinholes are obtained. The addition of ethyl acetate is found to play an important role in regulating the nucleation, which subsequently improves the compactness of the film. The quality of MAPbI3 films are further improved significantly through Ostwald recrystallization by optimizing the thermal treatment. The crystallinity is enhanced, the grain size is enlarged, and the defect density is reduced. Accordingly, the prepared MAPbI3 perovskite solar cell exhibits a record-high conversion efficiency, outstanding reproducibility, and stability, owing to the reduced electron recombination. The average and best efficiency reaches 19.2% and 20.3%, respectively. The device without encapsulation maintains 94% of the original efficiency after storage in ambient air for 600 h.

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“…For CPSC, it is clear that a thin but compact PCBM layer is embedded into the perovskite film (MAPbI 3‐x Cl x ‐PCBM composite) on ML‐ITO by anti‐solvent assisted method (Figure e and f). This PCBM layer is rather thin (~10 nm) that perovskite crystals underneath are still distinguishable, and is rather compact which will be effective to suppress the shunt losses, similar to the results from PCBM‐modified perovskite films . Moreover, such a thin layer is to the advantage of charge diffusion by largely reducing the transport resistance.…”

Section: Resultsmentioning

confidence: 56%

“…Following that, the counter electrode was thermally evaporated directly onto the annealed perovskite film to complete device fabrication (Figure b). Note that the PCBM‐assisted anti‐solvent technique has been proved to be effective to quench the perovskite precursors and to improve the surface topography of perovskite films . Compared with conventional 5L‐PSC (Figure a), it is clearly notable that the device structure and fabrication process of CPSC have been simplified significantly by removing extra independent CTLs, which are of great potential for the development of cost‐effective commercialized PSCs.…”

Section: Resultsmentioning

confidence: 99%

Simplified Compact Perovskite Solar Cells with Efficiency of 19.6% via Interface Engineering

Liu

Chen

et al. 2020

Energy & Environ Materials

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For the commercialization of perovskite solar cells (PSCs), it is more appealing to develop high‐performance simplified PSCs where perovskite films are just sandwiched between the back and front electrodes, in order to simplify the fabrication process and to reduce the cost. However, to date, this kind of devices shows rather low performance, and there are few researches on this subject. Herein, we report on a kind of compact PSCs (CPSCs) that are free of independent charge transport layers (CTLs). The devices are realized by the use of organic monolayer‐modified effective electrodes, along with the use of [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM)‐assisted anti‐solvent technique to obtain ultra‐thin (~10 nm) PCBM‐embedded perovskite films. Compared to control devices, CPSCs achieve a promising champion power conversion efficiency of 19.6% with largely reduced hysteresis. Moreover, the unencapsulated CPSC shows good stability under ambient atmosphere, with only 10% efficiency loss after 60 days’ storage. This work indicates that, by delicate design, CPSCs with smaller materials consumption in device architecture can perform competitively as conventional PSCs. Further reduction in the actual usage of costly CTL materials can be expected upon our CPSCs by developing more facile and economic methods to prepare ultra‐thin CTLs.

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PCBM-blended chlorobenzene hybrid anti-solvent engineering for efficient planar perovskite solar cells

Cited by 20 publications

References 38 publications

Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells

Site‐selective Synthesis of β‐[70]PCBM‐like Fullerenes: Efficient Application in Perovskite Solar Cells

Highly Efficient and Stable MAPbI3 Perovskite Solar Cell Induced by Regulated Nucleation and Ostwald Recrystallization

Simplified Compact Perovskite Solar Cells with Efficiency of 19.6% via Interface Engineering

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