Enhanced carrier separation efficiency and performance in planar-structure perovskite solar cells through an interfacial modifying layer of ultrathin mesoporous TiO2

Zhu, Qing; Wang, Zijian; Cai, Xiong; Wang, Weiping; Wu, Gaozhu; Kong, Lijing; Zheng, Xiang; Cao, Yiyan; Wu, Yaping; Li, Xu; Wu, Zhiming; Kang, Junyong

doi:10.1016/j.jpowsour.2020.228251

Cited by 14 publications

(10 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Associated with the PL and TRPL spectra, the ability to accelerate photogenerated carrier extraction and suppress charge recombination by introducing CdS QDs into SnO 2 ETLs has been demonstrated. 51 It is reported that when S atoms meet Pb 2+ ions, S atoms can establish strong coordination with Pb 2+ ions in the perovskite layer, consequently forming a tiny passage to accelerate charge extraction from the perovskite layer to CdS (1.0%)−SnO 2 ETLs, thus improving the charge transfer at the interface. 27 All these results proved that CdS (1.0%)−SnO 2 is an excellent electron transfer layer dedicated to highly efficient PSCs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

An electron transport layer (ETL) with excellent conductivity and suitable band alignment plays a key role in accelerating charge extraction and transfer for achieving highly efficient planar perovskite solar cells (PSCs). Herein, a novel diluted-cadmium sulfide quantum dot (CdS QD)-assisted SnO2 ETL has been developed with a low-temperature fabrication process. The slight addition of CdS QDs first enhances the crystallinity and flatness of SnO2 ETLs so that it provides a promising workstation to obtain high-quality perovskite absorption layers. It also amazingly increases the conductivity of the SnO2 ETL by an order of magnitude and regulates the energy level matching between the SnO2 ETL and perovskite. These outstanding properties greatly accelerate the charge extraction and transfer. Thus, the MAPbI3-based PSCs with such a diluted-CdSQD-assisted SnO2 ETL achieve a maximum power conversion efficiency of 20.78% and obtain a better stability of devices in air. These findings testify the importance and potential of semiconductor QD modification on ETLs, which may pave the way for developing such composite ETLs for further enhancing photovoltaic performance of planar PSCs.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…This is mainly due to the large contact area between the mesoporous ETL and the perovskite layer, which promotes the electron transport process. [49,[58][59][60][61] Comparison of the HI values and photovoltaic performance of PSCs with planar and mesoporous structures are shown in Table 1. Similarly, because the Al 2 O 3 used in the super-mesoporous PSCs is an insulating scaffold and lacks the existence of c-TiO 2 layer, electron transport can only be completed by the perovskite itself, finally result in slower charge separation and transport rate.…”

Section: The Influence Of Device Architecturementioning

confidence: 99%

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Wang

Lei

et al. 2020

Solar RRL

View full text Add to dashboard Cite

The power conversion efficiency (PCE) of perovskite solar cells (PSCs) has exceeded 25%, showing great potential in the photovoltaic field. However, PSCs often show anomalous current density–voltage (J–V) hysteresis behavior in the forward and reverse scanning directions, which makes it impossible to accurately evaluate the performance of PSCs. Therefore, it is necessary to clearly understand the mechanism of hysteresis and suppress the hysteresis. Herein, the J–V hysteresis behavior in PSCs and strategies to suppress hysteresis is focused: first, the various factors that affect J–V hysteresis in PSCs are summarized. And the mechanism behind the various possible origins of hysteresis and the challenges encountered are explored. Then, the strategies to suppress or eliminate the hysteresis are summarized, including optimizing the perovskite light‐absorbing layer, improving the performance of the carrier transport layer and interface engineering. Finally, insights on the future development of the hysteresis are also provided.

show abstract

“…It should be noted that the mesoporous layer as the bottom substrate plays an important role in obtaining high-quality perovskite films using the one-step method . Mesoporous layers are important not only for increasing the electron extraction but also for acting as a “scaffold” to support the growth of perovskite films. , A composite electron transport structure consisting of a mesoporous layer and a dense layer is still the most popular configuration for a high-efficiency PSC. , Mesoporous TiO 2 with large pore sizes can affect the crystallization process of perovskite films and ultimately avoid the accumulation of charges on the interface to achieve the purpose of reduced hysteresis . However, the high sintering temperature (>450 °C) of the traditional mesoporous layers limits its application on the plastic flexible substrates, such as poly(ethylene terephthalate) (PET) and poly(ethylene naphthalate) (PEN) .…”

Section: Introductionmentioning

confidence: 99%

Flexible Perovskite Solar Cells with Enhanced Performance Based on a Void-Free Imbedded Interface via a Thin Layer of Mesoporous TiO₂

Gong

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

The interfacial contacts between the electron transport layer (ETL) and the perovskite film play a crucial role in high-performance perovskite solar cells (PSCs). Herein, we propose a method for depositing a low-temperature-processed mesoporous TiO 2 (mp-TiO 2 ) layer on the SnO 2 ETL (bl-SnO 2 ) with the flexible substrate to enhance the performance of the PSCs. This kind of mesoporous TiO 2 layer can both improve the interfacial contact without voids in the imbedded interface and enhance the mechanical stability in the interface between TiO 2 and perovskite. The upward growth of perovskite grains on the mesoporous TiO 2 layer leads to a uniform grain size and prevents voids at the ETL/perovskite interface. This excellent interfacial contact is the foundation for the collection and transportation of photogenerated electrons. As a result, the efficient PSCs achieve a power conversion efficiency (PCE) of 19.90% with the additional mp-TiO 2 layer on a flexible substrate. Furthermore, the unencapsulated flexible PSCs show enhanced storage stability and bending durability. This work paves the way for the fabrication of cost-effective and high-quality flexible PSCs with enhanced efficiency and mechanical stability.

show abstract

Enhanced carrier separation efficiency and performance in planar-structure perovskite solar cells through an interfacial modifying layer of ultrathin mesoporous TiO2

Cited by 14 publications

References 41 publications

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Flexible Perovskite Solar Cells with Enhanced Performance Based on a Void-Free Imbedded Interface via a Thin Layer of Mesoporous TiO₂

Contact Info

Product

Resources

About

Enhanced carrier separation efficiency and performance in planar-structure perovskite solar cells through an interfacial modifying layer of ultrathin mesoporous TiO2

Cited by 14 publications

References 41 publications

Diluted-CdS Quantum Dot-Assisted SnO2 Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Diluted-CdS Quantum Dot-Assisted SnO2 Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

The J–V Hysteresis Behavior and Solutions in Perovskite Solar Cells

Flexible Perovskite Solar Cells with Enhanced Performance Based on a Void-Free Imbedded Interface via a Thin Layer of Mesoporous TiO2

Contact Info

Product

Resources

About

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Diluted-CdS Quantum Dot-Assisted SnO₂ Electron Transport Layer with Excellent Conductivity and Suitable Band Alignment for High-Performance Planar Perovskite Solar Cells

Flexible Perovskite Solar Cells with Enhanced Performance Based on a Void-Free Imbedded Interface via a Thin Layer of Mesoporous TiO₂