Simple benzothiadiazole derivatives as buried interface materials towards efficient and stable n–i–p perovskite solar cells

Zhang, Jinbao; Fan, Naiyuan; Wang, Yan; Zhang, Cuiping; Zhu, Guojie; Du, Guozheng; Wei, Kun; Deng, Jidong; Luo, Zhide; Yang, Li

doi:10.1039/d2ta00224h

Cited by 19 publications

(19 citation statements)

References 54 publications

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“…The conductivity of these films was examined by recording the I – V curves of devices with the configuration FTO/CsBi 3– x Sb x I 10 (Figure d). Clearly, CsBi 2.7 Sb 0.3 I 10 showed a much higher conductivity compared to CBI, indicating faster charge separation in the CsBi 2.7 Sb 0.3 I 10 film, , which will be beneficial for increasing the charge collection efficiency in devices …”

Section: Resultsmentioning

confidence: 99%

“…Clearly, CsBi 2.7 Sb 0.3 I 10 showed a much higher conductivity compared to CBI, indicating faster charge separation in the CsBi 2.7 Sb 0.3 I 10 film, 30,31 which will be beneficial for increasing the charge collection efficiency in devices. 32 To examine the changes of the surface morphology of perovskite films, scanning electron microscopy (SEM) was performed for CBI and Sb-doped films. From Figure 3a, it can be clearly seen that the morphology of the CBI film was changed greatly after being doped with Sb.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Yang

Deng

et al. 2022

ACS Appl. Energy Mater.

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The CsBi3I10 (CBI) semiconductor as a light absorber emerges as a promising alternative to lead-based perovskites owing to its low toxicity, good stability, and satisfying physical properties. However, CBI exhibits an uncontrollable crystallization process, poor film morphology, high defect density, and short carrier lifetime, which lead to inferior optoelectronic properties, limiting its practical application in solar cell devices. Here, the Sb doping strategy is successfully developed for CBI films by a one-step antisolvent-free fabrication method. It is found that Sb incorporation in binary CsBi3–x Sb x I10 can modulate the crystallization kinetics and optimize the film quality. As a result, polycrystalline films with high density and few pinholes are obtained to enable the enhancement of light absorbance, reduction of defects, suppression of nonradiative recombination, and increase of surface hydrophobicity. The solar cells based on the CsBi2.7Sb0.3I10 film show a remarkably improved power conversion efficiency of 0.82% compared to that of pristine CBI (0.22%), which is among the highest reported efficiencies for CBI-based thin-film solar cells. Moreover, unencapsulated devices based on Sb-doped CBI exhibit outstanding environmental stability and moisture tolerance. This work not only offers insights into understanding the binary Bi-based materials but also provides a new way to fabricate efficient and stable Bi-based solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Yang

Deng

et al. 2022

ACS Appl. Energy Mater.

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“…From Figure 4d, we noticed that the thickness of the perovskite film on SnO 2 is about 565 nm, which agrees well with our previous work. 33,34 It has to be noted that the concentration and composition of perovskite precursor solution for n−i−p and p−i−n devices are different, which is the reason for the variation in thickness. These results demonstrate that our exfoliation technique is sufficient and reliable to characterize the buried interfaces as well as crosssection features of flexible solar cells.…”

Section: ■ Resultsmentioning

confidence: 99%

Facile Exfoliation of the Perovskite Thin Film for Visualizing the Buried Interfaces in Perovskite Solar Cells

Wei

Yang

Deng

et al. 2022

ACS Appl. Energy Mater.

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The morphology and structure of buried interfaces play decisive roles in determining the efficiency and stability of perovskite solar cells (PSCs). However, challenges remain in directly visualizing the buried interfaces by existing nondestructive techniques. Here, we have developed a facile technique to integrally exfoliate the perovskite film (up to an area of 25 cm2) from both flexible and rigid glass substrates by introducing a cross-linkable polymer capping layer on the devices. This simple exfoliation approach enables comprehensive characterization of the influences of bottom electrode materials on the perovskite buried interfaces. This method has also been extended to fabricate the cross-section samples for flexible solar cells. Our results show that the roughness and wettability of substrate materials significantly influence the effectiveness and efficiency of film exfoliation, which could pose great impacts on the reliability in understanding the interfacial properties. We also evaluated the residuals on both sides of the substrate and the perovskite bottom, discovering that a clear and complete perovskite separation can be obtained for SnO2/perovskite interfaces. However, cross-contamination occuring at poly[bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA)/perovskite interfaces considerably restricts the reliable examination of the buried interfaces. Poly[(9,9-bis(3′-((N,Ndimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] dibromide as an interlayer between PTAA and perovskite was found to be favorable in obtaining clean and residual-free exfoliated interfaces. The developed exfoliation technique provides a facile and nondestructive way for directly visualizing the buried interfaces in PSCs, and this work will generate some insights in understanding the buried interfaces in optoelectronic devices.

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“…Effective conversion of solar energy into electricity has been developed as an essential strategy for sustainable development. Representative techniques in this respect include perovskite solar cells, − organic solar cells, − and dye-sensitized solar cells (DSSCs). − Among them, DSSCs have attracted intensive attention as an eco-friendly, readily fabricated, and relatively efficient technique. As one of the core components of DSSCs, sensitizers are employed to harvest the sunlight and donate the excited electrons to the TiO 2 semiconductor. , Commonly used sensitizers include ruthenium dyes, − metal-free organic dyes, − and porphyrin dyes. − To develop high-performance sensitizers, panchromatic absorption is desired.…”

Section: Introductionmentioning

confidence: 99%

Efficient Dye-Sensitized Solar Cells Based on a New Class of Doubly Concerted Companion Dyes

Zou

Wang

Baryshnikov

et al. 2022

ACS Appl. Mater. Interfaces

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To develop efficient dye-sensitized solar cells (DSSCs), concerted companion (CC) dyes XW60–XW63 constructed from the covalent linkage of a strapped porphyrin dye unit and an organic dye unit have been reported to exhibit panchromatic absorption and excellent photovoltaic performance. However, these CC dyes only afforded moderate V OC values of ca. 763 mV, demonstrating relatively weak antiaggregation ability, which remains an obstacle for further enhancing the photovoltaic behavior. To address this problem, we herein develop porphyrin dyes XW77–XW80 with the macrocycles wrapped with alkoxy chains of various lengths (OC6H13–OC22H45) and the corresponding CC dyes XW81–XW84 containing these porphyrin dye units. Interestingly, the new CC dyes XW81–XW83 exhibit increasing V OC from 745 to 784 mV with the chain lengths extended from C6 to C18, and a lowered V OC of 762 mV was obtained for XW84 when the chain length was further extended to C22. As a result, XW83 afforded the highest PCE of 12.2%, which is, to the best of our knowledge, the record efficiency for the iodine electrolyte-based solar cells sensitized with a single dye. These results can be rationalized by the so-called doubly concerted companion (DCC) effects, that is, the two subdye units exhibit not only complementary absorption but also concerted antiaggregation with the long wrapping chains on the porphyrins unit simultaneously protecting the porphyrin macrocycle and the neighboring organic subdye unit, thus affording panchromatic absorption and strong antiaggregation and anticharge-recombination ability. These results provide a new approach for constructing a class of DCC dyes to achieve high-performance DSSCs without using any antiaggregating coadsorbent or absorption-enhancing cosensitizer.

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Simple benzothiadiazole derivatives as buried interface materials towards efficient and stable n–i–p perovskite solar cells

Abstract: The state-of-the-art electron transport materials (ETMs) in n-i-p PSCs strongly rely on inorganic metal oxides (e.g. TiO2), but they often require high-temperature fabrication and complicated manufacturing. Moreover, little attention has...

Cited by 19 publications

References 54 publications

Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Facile Exfoliation of the Perovskite Thin Film for Visualizing the Buried Interfaces in Perovskite Solar Cells

Efficient Dye-Sensitized Solar Cells Based on a New Class of Doubly Concerted Companion Dyes

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Simple benzothiadiazole derivatives as buried interface materials towards efficient and stable n–i–p perovskite solar cells

Abstract: The state-of-the-art electron transport materials (ETMs) in n-i-p PSCs strongly rely on inorganic metal oxides (e.g. TiO2), but they often require high-temperature fabrication and complicated manufacturing. Moreover, little attention has...

Cited by 19 publications

References 54 publications

Antimony Doping of CsBi3I10 for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Antimony Doping of CsBi3I10 for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Facile Exfoliation of the Perovskite Thin Film for Visualizing the Buried Interfaces in Perovskite Solar Cells

Efficient Dye-Sensitized Solar Cells Based on a New Class of Doubly Concerted Companion Dyes

Contact Info

Product

Resources

About

Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells

Antimony Doping of CsBi₃I₁₀ for Tailoring the Film Morphology and Defects toward Efficient Lead-Free Thin-Film Solar Cells