3D Bicontinuous Nanoporous Reduced Graphene Oxide for Highly Sensitive Photodetectors
3D Bicontinuous Nanoporous Reduced Graphene Oxide for Highly Sensitive Photodetectors
复制标题
DOI：
10.1002/adfm.201504146
复制
发表时间：
2016-02
影响因子：
19
通讯作者：
Yoshikazu Ito;Wenfeng Zhang;Jinhua Li;Haixin Chang;Pan Liu;T. Fujita;Yongwen Tan;Feng Yan
中科院分区：
文献类型：
--
作者：
Yoshikazu Ito;Wenfeng Zhang;Jinhua Li;Haixin Chang;Pan Liu;T. Fujita;Yongwen Tan;Feng Yan
还原氧化石墨烯（RGO）是一种重要的石墨烯衍生物，由于化学氧化产生的带隙，在光子学和光电子学中具有重要的应用。然而，由化学剥离的氧化石墨制成的大多数RGO材料是2D薄片。由于光-物质相互作用弱以及堆叠薄片之间的电接触不良，它们的光电性能显著恶化。在这里，我们报告了一种双连续3D纳米多孔RGO（3D np-RGO），具有高光电性能，可用于高灵敏度的光电探测器。3D np-RGO表现出比单层石墨烯材料高40倍以上的光吸收和比来自离散RGO薄片的常规RGO高至少两个数量级的电子迁移率。具有最佳还原状态的np-RGO在室温下显示出3.10 3 104 A W-1的光响应，在类似的光强度辐射水平下比石墨烯和其他石墨烯衍生物高出大约四个数量级，并且比商业硅光电探测器更好的1.04 3 107%的优异的外量子效率。将光子转换为光电流的能力源于强烈增强的光吸收、促进的光载流子传输以及3D互连双连续RGO网络中的可调含氧缺陷和还原态。
Reduced graphene oxide (RGO) is an important graphene derivative for applications in photonics and optoelectronics because of the band gap created by chemical oxidation. However, most RGO materials made by chemically exfoliated graphite oxide are 2D flakes. Their optoelectronic performance deteriorates significantly as a result of weak light‐matter interaction and poor electrical contact between stacking flakes. Here we report a bicontinuous 3D nanoporous RGO (3D np‐RGO) with high optoelectronic performance for highly sensitive photodetectors. 3D np‐RGO demonstrates a over 40 times higher light absorption than monolayer graphene materials and at least two orders of magnitude higher electron mobility than conventional RGO from discrete RGO flakes. The np‐RGO with an optimal reduction state shows ultrahigh photoresponse of 3.10 3 104 A W−1 at room temperature, approximately four orders of magnitude higher than graphene and other graphene derivatives at similar levels of light intensity radiations, and the excellent external quantum efficiency of 1.04 3 107% better than commercial silicon photodetector. The ultrahigh capability of conversing photons to photocurrent originates from strongly enhanced light absorption, facilitated photocarrier transport, and tunable oxygenous defects and reduction states in the 3D interconnected bicontinuous RGO network.