题目：

Hybrid Graphene�Perovskite Phototransistors with Ultrahigh Responsivity and Gain

作者：

Yusheng Wang ¹, Yupeng Zhang ², Yao Lu¹ , Weidong Xu ¹, Haoran Mu ¹, Caiyun Chen¹ , Hong Qiao¹ , Jingchao Song ², Shaojuan Li ¹, Baoquan Sun ,^1* Yi-Bing Cheng ,²* and Qiaoliang Bao ^1,2*

单位：

¹Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou 215123 , P. R. China

²Department of Materials Science and Engineering Monash University Clayton , Victoria 3800 , Australia, Melbourne Centre for Nanofabrication 151 Wellington Road , Clayton , Victoria 3168 , Australia

摘要：

Graphene is an attractive optoelectronic material for light detection because of its broadband light absorption and fast response time. However, the rela-tively low absorption cross-section, fast recombination rate, and the absence of gain mechanism have limited the responsivity of pure graphene-based phototransistor to ≈10 ⁻²A W ⁻¹. In this work, a photoconductive gain of ≈10 ⁹electrons per photon and a responsivity of ≈6.0 ×10 ⁵A W ⁻¹are demonstrated in a hybrid photodetector that consists of monolayer graphene covered with a thin layer of dispersive organolead halide perovskite (CH 3NH 3PbBr 2I) islands. The unprecedented performance is attributed to the effective charge transfer and photogating effect, which were evidenced by photoluminescence quenching, time-resolved photoluminescence decay, scanning near-field optical microscopy, and photocurrent mapping. Unlike previous report which used perovskite bulk thin film, the perovskite islands have low bulk recombi-nation rate of photogenerated carriers. The device also shows broad photode-tection spectral range from ultraviolet to visible (250�700 nm), affording new opportunities for scalable UV detectors and imaging sensors.

影响因子：

4.062

分区情况：

2区

链接：

http://onlinelibrary.wiley.com/doi/10.1002/adom.201500150/full