TiO<sub>2</sub> Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

Lü, Hao; Tian, Wei; Gu, Bangkai; Zhu, Yayun; Li, Liang

doi:10.1002/smll.201701535

Cited by 87 publications

(42 citation statements)

References 42 publications

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“…[3] In contrast, when TiO x is used as ETL, strong normal hysteresis occurs which is related to charge collection problems. The CB values for TiO x vary in the literature from À4.0 [31] to À4.2, [30] and depend on the fabrication method, [33] therefore in our case, for the low-temperature TiO x the CB can be different.…”

Section: Discussionmentioning

confidence: 95%

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

et al. 2018

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In order to achieve highly efficient perovskite solar cells in n–i–p geometry with little hysteresis, CdS is investigated as low‐cost, easily processable electron transport layer (ETL). For comparison, also perovskite solar cells without ETL or with low‐temperature processed compact TiOx as well as combinations of TiOx and CdS in dual layer ETLs are investigated. It is found that CdS strongly suppresses hysteresis and that even inverted hysteresis can occur, caused by the much higher electron mobility of CdS in comparison to TiOx. Additionally, SIMS depth profiles reveal that iodide diffusion is suppressed when CdS instead of TiOx is in contact to the perovskite layer. For cells which are processed in ambient atmosphere, a highest efficiency with CdS as ETL >10% with minimal hysteresis is achieved.

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Section: Discussionmentioning

confidence: 95%

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

et al. 2018

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“…The TiO 2 layer serves as ETL and contributes to the efficient carrier separation, which can significantly reduce the carrier recombination in the interface of CsPbBr 3 /TiO 2. This accounts for the enhanced photocurrent after the interfacial engineering with TiO 2 layer (see Figure a). The CsPbBr 3 PDs with interfacial modification engineering provide a highly efficient way to promote charge carriers separation and extraction.…”

Section: Performance Comparison Of Self‐powered Pds Based On Hybrid Pmentioning

confidence: 87%

“…[ 21] This accounts for the enhanced photocurrent after the interfacial engineering Small 2019, 15,1902135 with TiO 2 layer (see Figure 1a). The CsPbBr 3 PDs with interfacial modification engineering provide a highly efficient way to promote charge carriers separation and extraction.…”

mentioning

confidence: 98%

Atomic‐Layer Deposition‐Assisted Double‐Side Interfacial Engineering for High‐Performance Flexible and Stable CsPbBr₃ Perovskite Photodetectors toward Visible Light Communication Applications

Cen

Liu

Zhao

et al. 2019

Small

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Self‐powered photodetectors (PDs) based on inorganic metal halide perovskites are regarded as promising alternatives for the next generation of photodetectors. However, uncontrollable film growth and sluggish charge extraction at interfaces directly limit the sensitivity and response speed of perovskite‐based photodetectors. Herein, by assistance of an atomic layer deposition (ALD) technique, CsPbBr3 perovskite thin films with preferred orientation and enlarged grain size are obtained on predeposited interfacial modification layers. Thanks to improved film quality and double side interfacial engineering, the optimized CsPbBr3 (Al2O3/CsPbBr3/TiO2, ACT) perovskite PDs exhibit outstanding performance with ultralow dark current of 10−11 A, high detectivity of 1.88 × 1013 Jones and broad linear dynamic range (LDR) of 172.7 dB. Significantly, excellent long‐term environmental stability (ambient conditions >100 d) and flexibility stability (>3000 cycles) are also achieved. The remarkable performance is credited to the synergistic effects of high carrier conductivity and collection efficiency, which is assisted by ALD modification layers. Finally, the ACT PDs are successfully integrated into a visible light communication system as a light receiver on transmitting texts, showing a bit rate as high as 100 kbps. These results open the window of high performance all‐inorganic halide perovskite photodetectors and extends to rational applications for optical communication.

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“…The measured work function of ZTO was 0.1 eV smaller than that of TiO 2 (Figure S11 and S12, Supporting Information). Given that the Fermi level is very close to the conduction band (CB) for n‐type semiconductors, the CB of ZTO was estimated to be about −4.1 eV, an appropriate energy level of ETL for PSCs . The valence band (VB) of ZTO was also obtained to be −7.7 eV by calculation according to the reported bandgap of 3.6 eV .…”

Section: Resultsmentioning

confidence: 99%

Interface Engineering of Cubic Zinc Metatitanate as an Excellent Electron Transport Material for Stable Perovskite Solar Cells

Han

Huang

et al. 2020

Solar RRL

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Perovskite solar cells (PSCs) have experienced considerable development in the past few years. The stability issue has become a focus of research efforts toward their commercial applications. The development and interface engineering of electron transport materials (ETMs) to build up stable interfaces with perovskites has been emerging as a powerful strategy to enhance PSCs' stability. Herein, cubic zinc metatitanate (ZTO) is identified as an excellent ETM with interface engineering treatment of dezincification for fabricating PSCs with much better overall performances than those fabricated from TiO2, a popularly used ETM. The high electron mobility of ZTO helps minimize the hysteresis. Together with the use of CuSCN as inorganic hole transport material and further protecting the PSCs with reduced graphene oxide, the ZTO‐based PSCs exhibit remarkable enhancement in stability, retaining 95% of initial power conversion efficiency under AM 1.5 G illumination at 85 °C and 85% relative humidity in air for 1000 h at open circuit.

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TiO₂ Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

Cited by 87 publications

References 42 publications

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

Atomic‐Layer Deposition‐Assisted Double‐Side Interfacial Engineering for High‐Performance Flexible and Stable CsPbBr₃ Perovskite Photodetectors toward Visible Light Communication Applications

Interface Engineering of Cubic Zinc Metatitanate as an Excellent Electron Transport Material for Stable Perovskite Solar Cells

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TiO2 Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

Cited by 87 publications

References 42 publications

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

CdS as Electron Transport Layer for Low‐Hysteresis Perovskite Solar Cells

Atomic‐Layer Deposition‐Assisted Double‐Side Interfacial Engineering for High‐Performance Flexible and Stable CsPbBr3 Perovskite Photodetectors toward Visible Light Communication Applications

Interface Engineering of Cubic Zinc Metatitanate as an Excellent Electron Transport Material for Stable Perovskite Solar Cells

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TiO₂ Electron Transport Bilayer for Highly Efficient Planar Perovskite Solar Cell

Atomic‐Layer Deposition‐Assisted Double‐Side Interfacial Engineering for High‐Performance Flexible and Stable CsPbBr₃ Perovskite Photodetectors toward Visible Light Communication Applications