Enhanced Charge Extraction of Li-Doped TiO2 for Efficient Thermal-Evaporated Sb2S3 Thin Film Solar Cells

Chen, Lan; Luo, Jingting; Lan, Huabin; Fan, Bo; Peng, Huizhen; Zhao, Jun; Sun, Hong‐Bo; Zheng, Zhaoke; Liang, Guangxing; Fan, Ping

doi:10.3390/ma11030355

Cited by 38 publications

(22 citation statements)

References 31 publications

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“…The higher FF of the SOL-5.8-MP compared to that of the SOL-5.8-CL devices, resulting in higher PCE, is attributed to the added Li-doped mesoporous-TiO 2 layer, which facilitates efficient electron extraction at the perovskite-TiO 2 interface and passivates trapping states in TiO 2 . 47,48 Moreover, the presence of the MP-TiO 2 layer reduces the possible direct contact between the perovskite layer and the FTO electrode, which could occur due to the possible presence of tiny voids in the CL-TiO 2 layer (see Fig. S7(a)-(c) for the morphology of the TiO 2 films).…”

Section: Resultsmentioning

confidence: 99%

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

et al. 2020

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Section: Resultsmentioning

confidence: 99%

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

et al. 2020

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“…The slight concentration of Sb atom at the interface of Sb 2 (S,Se) 3 /CdS, which may be caused by the a high MCN and low selenization temperature, may lead to rich sulfur vacancies. It has demonstrated that more sulfur vacancies in the absorber is able to increase the concentration of electrons and improve the V oc of the device . But the severe recombination resulted by the defects also cannot be ignored.…”

Section: Resultsmentioning

confidence: 99%

“…Although the remarkable grain size of the thin film can greatly reduce the numbers of grain boundaries from surface to depletion region, which will alleviate the recombination loss during charge carrier transportation. [53] But the severe recombination resulted by the defects also cannot be ignored. In addition, a 368 mV loss of present heterojunction was demonstrated when comparing with the built-in voltage of 1.1 V. It indicates that the quality of the heterojunction is not ideal.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Wang

Chen

et al. 2018

Adv Elect Materials

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eV), [1][2][3] remarkable absorption coefficient (≈10 5 cm −1 ), [4,5] excellent stability, and low-toxicity component. To promote the power conversion efficiency, many methods have been successfully applied to fabricate Sb 2 (S x ,Se 1-x ) 3 solar cells. For example, the rapid thermal evaporation (RTE) method [6] have been gathered many attentions for the fabrication of Sb 2 Se 3 solar cells. Recently, Tang and co-workers used a novel vapor transport deposition (VTD) way to refresh the recorded efficiency of Sb 2 Se 3 solar cell to 7.6%, [7] which has been made a great progress since Sb 2 Se 3 was successfully achieved a power conversion efficiency (PCE) of 0.03% in 2002. [8] On the other hand, Choi et al. have achieved a PCE of 7.5% [9] for Sb 2 S 3 by chemical bath deposition (CBD). Although the VTD and CBD methods have achieved impressive efficiency over 7%, a number of processing issues arise in these approaches. For example, VTD deposition processes are complex and expensive. While the nonvacuums CBD method also has weaknesses such as (i) the film prepared from CBD method is tend to be amorphous; [8,10] (ii) the Sb 2 S 3 film prepared by CBD method is antimony rich which results in a higher mean coordination number (MCN) than the stoichiometric Sb 2 S 3 . It will make it too rigid to flatten out after the annealing step; [11] (iii) the Sb 2 S 3 film prepared by CBD method inevitably includes impurities such as SbOCl, Sb 2 O 3 , and Sb 2 (SO 3 ) 3 . [12][13][14] Meanwhile, although the crystalline of the film fabricated by RTE or VTD is promising, the compactness of the absorber needs a further improvement. Thus, seeking for an effective and easy-handle nonvacuum approach to improve Sb 2 (S x ,Se 1-x ) 3 thin film solar cells is urgently needed.Since the hydrothermal method is a useful method in thin film preparation, the quality and homogeneity of the film deposited by this method is remarkable, which is expected to be able to solve the problem mentioned above and cut down the cost of fabrication. Liu et al. have taken this method to prepare the Sb 2 S 3 thin films, but there is no device reported. [15] In our previous work, double buffer layer was used to tune the band align and reduce recombination, which has achieved V oc as high as 792 mV based on hydrothermal derived Sb 2 (S x ,Se 1-x ) 3 solar cell. [16] But the thick buffer layer (60 nm TiO 2 + 60 nm CdS) inevitably increases the R s of device and decreases the transmittance as well, both of which will reduce J sc and PCE. Besides, the formation mechanism for Sb 2 S 3 thin films based Antimony sulfide-selenide Sb 2 (S,Se) 3 as a promising absorber material has drawn extensive attention owing to its rewarding photoelectric properties, low toxicity, and earth abundant components. Here, an available and highly effective method, in situ hydrothermal growth accompanied with postselenization, is successfully applied to fabricate Sb 2 (S,Se) 3 solar cells. The rationale for the preparation of Sb 2 S 3 precursors by the hydrothermal method is discussed, and ...

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“…For this problem, by neglecting the quality of absorber, the band gap offset alignment is expected to solve this problem effectively through improving the extraction of charge carriers. It has been demonstrated that the transportation of electrons between the absorber layer and the electron transporting layer can make a great influence on the PCE of Sb 2 (S,Se) 3 thin film solar cells by tuning the band gap offset at the interface . In addition, series works basing on various electron transporting layer have been carried out by Tang's group, which revealed that the selection of a better electron transporting layer for Sb 2 (S,Se) 3 thin film solar cells is very important.…”

Section: Introductionmentioning

confidence: 99%

Promising Sb₂(S,Se)₃ Solar Cells with High Open Voltage by Application of a TiO₂/CdS Double Buffer Layer

Wang¹,

Wang²,

Chen³

et al. 2018

Solar RRL

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Sb 2 (S,Se) 3 has gathered a lot of attention recently as a promising alternative absorber material. However, the efficiencies of Sb 2 (S,Se) 3 devices are seriously restricted by the low open circuit voltage (V oc ). In this work, Sb 2 (S, Se) 3 devices equipped with a TiO 2 /CdS double buffer layer are prepared by a hydro-thermal method, which aims to overcome the V oc deficit. The obtained average V oc of the devices is 785 mV and the champion efficiency of 5.73% is also achieved with a highest V oc ¼ 792 mV, Jsc ¼ 12.03 mA cm À2 , FF ¼ 60.9%. The improvement of V oc is benefited from the reduced band gap offset after application of the double buffer layer. The non-encapsulated device could keep an average power conversion efficiency of 5.69% after being stored in ambient air over a month. This indicates the great potential of a double buffer layer in new chalcogenide photovoltaic devices.

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Enhanced Charge Extraction of Li-Doped TiO2 for Efficient Thermal-Evaporated Sb2S3 Thin Film Solar Cells

Cited by 38 publications

References 31 publications

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Promising Sb₂(S,Se)₃ Solar Cells with High Open Voltage by Application of a TiO₂/CdS Double Buffer Layer

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Enhanced Charge Extraction of Li-Doped TiO2 for Efficient Thermal-Evaporated Sb2S3 Thin Film Solar Cells

Cited by 38 publications

References 31 publications

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

Ambient condition-processing strategy for improved air-stability and efficiency in mixed-cation perovskite solar cells

Over 6% Certified Sb2(S,Se)3 Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Promising Sb2(S,Se)3 Solar Cells with High Open Voltage by Application of a TiO2/CdS Double Buffer Layer

Contact Info

Product

Resources

About

Over 6% Certified Sb₂(S,Se)₃ Solar Cells Fabricated via In Situ Hydrothermal Growth and Postselenization

Promising Sb₂(S,Se)₃ Solar Cells with High Open Voltage by Application of a TiO₂/CdS Double Buffer Layer