Enhanced electron extraction using SnO2 for high-efficiency planar-structure HC(NH2)2PbI3-based perovskite solar cells

Jiang, Qi; Zhang, Liuqi; Wang, Haolin; Yang, Xiaolei; Meng, Jiaqi; Liu, Heng; Yin, Zhigang; Wu, Jinliang; Zhang, Xingwang; You, Jingbi

doi:10.1038/nenergy.2016.177

Cited by 1,783 publications

(986 citation statements)

References 44 publications

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“…[3] Unfortunately, it is not very efficient due to the charge blocking effects at the TiO 2 /perovskite interface. [36] Very recently, a novel Cl-capped TiO 2 NC was used as electron selective layer in perovskite solar cells; [31] Device Fabrication: The glass was sequentially cleaned using detergent, acetone, and isopropanol with ultrasonication for 10 min each and then were dried and treated by O 2 plasma for 15 min. The TiO 2 NC solution was spin coated on glass substrates at 2000 rpm for 45 s and annealed in ambient air at 150 °C for 30 min.…”

Section: Methodsmentioning

confidence: 99%

“…[35,36] We also tried SnO 2 NC/perovskite bilayer structure, but the device works very poorly with even larger dark current and lower on/off ratio comparing with the compact TiO 2 /perovskite device ( Figure S5, Supporting Information), this is most likely originated from poor energy level matching of the two materials. [36] These additional experiments indicate clearly the importance of selecting appropriate electron transport layer in achieving overall high performance. We also fabricated devices with Au electrodes and Al top electrodes, but the devices do not work well (details can be found in Figure S6 …”

Section: Doi: 101002/aelm201700251mentioning

confidence: 99%

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TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

Ren

Chen

et al. 2017

Adv Elect Materials

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long carrier diffusion lengths, [9,10] and low deep-state defects. [11,12] Owing to their exciting photovoltaic applications, their promising potential in photodetection is drawing growing interest. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Yang and co-workers first fabricated a vertical perovskite photodetector, [13] which demonstrated excellent light detecting capability. Lateral photodetectors are easy to make, and more importantly, their intrinsic gain mechanism can lead to very high photosensitivity. [30] Thereby many efforts have been devoted to developing such lateral devices. For single-layer perovskite devices reported, [14][15][16][17] relatively high detectivity (≈10 12 Jones) and short rise/decay time (dozens of milliseconds) were realized, but this is always associated with low on/ off ratios and poor electrical instabilities (induced by ion migration). To meet such challenge, bilayer devices are designed: perovskite film responsible for light absorption and another material film responsible for carriers transport. Significant enhancement in photoresponsivity has been achieved. [18][19][20][21][22][23][24] However, the reported bilayer devices usually employed high-conductive 2D layer to function as main photocarrier transport channel, and this leads to certain detrimental defects. For example, the graphene/perovskite bilayer devices exhibit very low on/off ratio of smaller than 2, [18][19][20][21] and the transition metal sulfides (WS 2 , MoS 2 )/perovskite bilayer devices have very long rise/decay time of a few seconds. [22,23] Also, it should be noted that graphene and the transition metal sulfides are usually deposited by complex and costly process, such as chemical vapor deposition, mechanical exfoliation, and hence is not suitable for large-area fabrication. Solutionprocessed MoS 2 [24] or organic [25,26] /CH 3 CH 3 PbI 3 photodetectors have been fabricated, but their performances are still limited by low on/off ratios of <500. Here we employed TiO 2 nanocrystal (NC) film to transport photocarrier. The designed TiO 2 NC/perovskite bilayer photodetector exhibits high overall performance with on/off ratio of 4000, photodetectivity of 1.85 × 10 12 Jones, and rise/decay time of 0.49/0.56 s. Figure 1a presents the schematic structure of the TiO 2 NC/ perovskite bilayer photodetector fabricated on a glass substrate. First, the TiO 2 NC film was spin coated on the glass substrate, and then Al electrodes were thermally evaporated on the TiO 2 NC film with help of an interdigital mask, resulting in a channel length of 80 µm and a channel width of 8800 µm. The perovskite film (CH 3 NH 3 PbI 3 ) was then spin coated on the TiO 2 NC film, completing the device fabrication (details Owing to their attractive performance in photovoltaic devices, organolead halide perovskite materials have attracted enormous interest for photodetector applications. However, current perovskite-based photodetectors mainly rely on high-conductive 2D materials such as graphene or transition metal sulfi...

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Section: Methodsmentioning

confidence: 99%

Section: Doi: 101002/aelm201700251mentioning

confidence: 99%

TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

Ren

Chen

et al. 2017

Adv Elect Materials

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“…Atomic layer deposited SnO 2 was once utilized by Anders Hagfeldt's group to fabricate efficient planar n-i-p devices, but the cost for the atomic layer deposition was disadvantageous for commercial application [21]. Most reported solution processes for SnO 2 preparation employed organic sols [22,23], purchased nanoparticles dilutions [24], or SnCl 4 /SnCl 2 ·2H 2 O precursors [20,25,26], which were operated under 150°C-200°C. In our recent work, we explored a sol-gel route for fabricating crystallized SnO 2 ETL below 80°C, which significantly advanced the low temperature fabrication of PSCs and the development of flexible photovoltaic devices [27].…”

Section: Introductionmentioning

confidence: 99%

Tailoring electrical property of the low-temperature processed SnO2 for high-performance perovskite solar cells

Liu

Dong

et al. 2018

Sci. China Mater.

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“…This compactn -type metal-oxide film could preventd irect contact between the TCO and HTMs. [11] Usually,t he compactn -type metal-oxide film is considered an indispensable part in the PSC structure as it decreases the recombination of photogenerated charge carriers,which helps improvingt he photovoltaic performance of PSCs.M any inorganic n-type semiconductors,s uch as TiO 2 , [12,13] SnO 2 , [14][15][16][17][18] ZnO, [19][20][21] and Zn 2 SnO 4 [22] are confirmed good ETL candidates for highly efficient PSCs because of their suitable opticala nd electrical properties.A mong them, the most common compactn -type metal oxide is TiO 2 ,w hich is deposited through asol-gel method, [23] aerosol spray pyrolysis, [3] or spin-coating methods. [24,25] Thus,t remendouse fforts mainly focus on the optimization of the compact n-type TiO 2 film to improve the efficiencies of PSCs.…”

Section: Introductionmentioning

confidence: 99%

Interface Engineering of electron Transport Layer‐Free Planar Perovskite Solar Cells with Efficiency Exceeding 15 %

Huang

Guo

et al. 2017

Energy Tech

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A high‐performance electron transport layer (ETL)‐free planar fluorine‐doped tin oxide (FTO)/perovskite/hole‐transport material/Au solar cell was prepared. We revealed that a plasma‐cleaning pretreatment for FTO substrates could significantly improve the quality of perovskite films, leading to the promotion of charge separation, an increase in the electron‐transport rate, and a decrease in the recombination reaction at the FTO/perovskite interface. Finally, the efficiency of the cells was greatly improved. A power conversion efficiency of over 15 % and a fill factor of 0.68 were achieved under AM 1.5G 100 mW cm−2 irradiation without the use of a compact n‐type metal‐oxide blocking layer.

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Enhanced electron extraction using SnO2 for high-efficiency planar-structure HC(NH2)2PbI3-based perovskite solar cells

Cited by 1,783 publications

References 44 publications

TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

Tailoring electrical property of the low-temperature processed SnO2 for high-performance perovskite solar cells

Interface Engineering of electron Transport Layer‐Free Planar Perovskite Solar Cells with Efficiency Exceeding 15 %

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Enhanced electron extraction using SnO2 for high-efficiency planar-structure HC(NH2)2PbI3-based perovskite solar cells

Cited by 1,783 publications

References 44 publications

TiO2 Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

TiO2 Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

Tailoring electrical property of the low-temperature processed SnO2 for high-performance perovskite solar cells

Interface Engineering of electron Transport Layer‐Free Planar Perovskite Solar Cells with Efficiency Exceeding 15 %

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TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors

TiO₂ Nanocrystal/Perovskite Bilayer for High‐Performance Photodetectors