Hybrid mixed-dimensional WTe(2)/CsPbI(3)perovskite heterojunction for high-performance photodetectors.

Perovskites have showed significant potential for the application in photodetectors due to their outstanding electrical and optical properties. Integrating two-dimensional (2D) materials with perovskites can make full use of the high carrier mobility of 2D materials and strong light absorption of perovskite to realize excellent optoelectrical properties. Here, we demonstrate a photodetector based on the WTe2/CsPbI3heterostructure. The quenching and the shortened lifetime of photoluminescence (PL) for CsPbI3perovskite confirms the efficient charge transfer at the WTe2/CsPbI3heterojunction. After coupled with WTe2, the photoresponsivity of the CsPbI3photodetector is improved by almost two orders of magnitude due to the high-gain photogating effect. The WTe2/CsPbI3heterojunction photodetector reveals a large responsivity of 1157 A W-1and a high detectivity of 2.1 × 1013Jones. The results pave the way for the development of high-performance optoelectronic devices based on 2D materials/perovskite heterojunctions.

Song X ，Jian Y ，Wang X ，Chen J ，Shan Q ，Zhang S ，Chen Z ，Chen X ，Zeng H ... -  《-》

High responsivity of hybrid MoTe(2)/perovskite heterojunction photodetectors.

Two-dimensional (2D) van der Waals heterojunction offers alternative facile platforms for many optoelectronic devices due to no-dangling bonds and steep interface carrier gradient. Here, we demonstrate a 2D heterojunction device, which combines the benefits of high carrier mobility of 2D MoTe2and strong light absorption of perovskite, to achieve excellent responsivity. This device architecture is constructed based on the charge carriers separation and transfer with the high-gain photogating effect at the interface of the heterojunction. The device exhibits high responsivity of 334.6 A W-1, impressive detectivity of 6.2 × 1010Jones. All the results provide the insight into the benefits of interfacial carriers transfer for designing hybrid perovskite-2D materials based optoelectronic devices.

Xie A ，Jian Y ，Cheng Z ，Gu Y ，Chen Z ，Song X ，Yang Z ... -  《-》

SnS(2)/MoS(2) van der Waals Heterostructure Photodetector with Ultrahigh Responsivity Realized by a Photogating Effect.

Quan S ，Li L ，Guo S ，Zhao X ，Weller D ，Wang X ，Fu S ，Liu R ，Hao Y ... -  《-》

Boosting Two-Dimensional MoS(2)/CsPbBr(3) Photodetectors via Enhanced Light Absorbance and Interfacial Carrier Separation.

Song X ，Liu X ，Yu D ，Huo C ，Ji J ，Li X ，Zhang S ，Zou Y ，Zhu G ，Wang Y ，Wu M ，Xie A ，Zeng H ... -  《-》

Ultrathin Ruddlesden-Popper Perovskite Heterojunction for Sensitive Photodetection.

Thanks to their unique optical and electric properties, 2D materials have attracted a lot of interest for optoelectronic applications. Here, the emerging 2D materials, organic-inorganic hybrid perovskites with van der Waals interlayer interaction (Ruddlesden-Popper perovskites), are synthesized and characterized. Photodetectors based on the few-layer Ruddlesden-Popper perovskite show good photoresponsivity as well as good detectivity. In order to further improve the photoresponse performance, 2D MoS2 is chosen to construct the perovskite-MoS2 heterojunction. The performance of the hybrid photodetector is largely improved with 6 and 2 orders of magnitude enhancement for photoresponsivity (104 A W-1 ) and detectivity (4 × 1010 Jones), respectively, which demonstrates the facile charge separation at the interface between perovskite and MoS2 . Furthermore, the contribution of back gate tuning is proved with a greatly reduced dark current. The results demonstrated here will open up a new field for the investigation of 2D perovskites for optoelectronic applications.

Fu Q ，Wang X ，Liu F ，Dong Y ，Liu Z ，Zheng S ，Chaturvedi A ，Zhou J ，Hu P ，Zhu Z ，Bo F ，Long Y ，Liu Z ... -  《-》