A Microchannel‐Confined Crystallization Strategy Enables Blade Coating of Perovskite Single Crystal Arrays for Device Integration

Perovskite single crystals (PSCs) possess superior optoelectronic properties compared to their corresponding polycrystalline films, but their applications of PSCs in high‐performance, integrated devices are hindered by their heavy thickness and difficulty in scalable deposition. Here, a microchannel...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2020-04, Vol.32 (16), p.e1908340-n/a
Main Authors: Deng, Wei, Jie, Jiansheng, Xu, Xiuzhen, Xiao, Yanling, Lu, Bei, Zhang, Xiujuan, Zhang, Xiaohong
Format: Article
Language:English
Subjects:
Arrays
Blade coating
Carrier lifetime
Crystal structure
Crystallization
Crystals
Deposition
Embedded structures
image sensors
Materials science
Microchannels
microchannel‐confined crystallization
Optoelectronic devices
perovskite single crystals
Perovskites
photodetectors
Single crystals
Thickness
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Summary:Perovskite single crystals (PSCs) possess superior optoelectronic properties compared to their corresponding polycrystalline films, but their applications of PSCs in high‐performance, integrated devices are hindered by their heavy thickness and difficulty in scalable deposition. Here, a microchannel‐confined crystallization (MCC) strategy to grow uniform and large‐area PSC arrays for integrated device applications is reported. Benefiting from the confinement effect of the microchannels, solution flow dynamics is well controlled, and thus uniform deposition of PSC arrays with suitable thickness is achieved, meaning they are applicable for scale‐up device applications. The resulting PSCs possess excellent optoelectronic properties in terms of a long carrier lifetime (175 ns) and an ultralow defect density (2 × 109 cm−3), which are comparable to the corresponding bulk crystals. The unique embedded structure of PSCs within the microchannels allows the construction of a high‐integration image sensor. This work paves the way toward high‐throughput growth of PSCs for integrated optoelectronic devices. A microchannel‐confined crystallization (MCC) strategy is proposed for scalable deposition of high‐quality perovskite single crystal (PSC) arrays through blade coating. The resultant PSC arrays exhibit perfect single‐crystalline nature and possess excellent optoelectronic properties. An image sensor based on the PSC arrays demonstrates a high‐sensitivity and high‐resolution imaging capability with a broad linear dynamic range and a large detectivity.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201908340