High-performance and scalable metal-chalcogenide semiconductors and devices via chalco-gel routes.

High-performance and scalable metal-chalcogenide semiconductors and devices via chalco-gel routes.
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DOI:
10.1126/sciadv.aap9104
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发表时间:
2018-04
期刊:
影响因子:
13.6
通讯作者:
Park SK
Park SK
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kwon SM;Won JK;Jo JW;Kim J;Kim HJ;Kwon HI;Kim J;Ahn S;Kim YH;Lee MJ;Lee HI;Marks TJ;Kim MG;Park SK

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Chalco-gel–based metal-chalcogenide semiconductors and scalable high-performance electronic devices were demonstrated. We report a general strategy for obtaining high-quality, large-area metal-chalcogenide semiconductor films from precursors combining chelated metal salts with chalcoureas or chalcoamides. Using conventional organic solvents, such precursors enable the expeditious formation of chalco-gels, which are easily transformed into the corresponding high-performance metal-chalcogenide thin films with large, uniform areas. Diverse metal chalcogenides and their alloys (MQx: M = Zn, Cd, In, Sb, Pb; Q = S, Se, Te) are successfully synthesized at relatively low processing temperatures (<400°C). The versatility of this scalable route is demonstrated by the fabrication of large-area thin-film transistors (TFTs), optoelectronic devices, and integrated circuits on a 4-inch Si wafer and 2.5-inch borosilicate glass substrates in ambient air using CdS, CdSe, and In2Se3 active layers. The CdSe TFTs exhibit a maximum field-effect mobility greater than 300 cm2 V−1 s−1 with an on/off current ratio of >107 and good operational stability (threshold voltage shift < 0.5 V at a positive gate bias stress of 10 ks). In addition, metal chalcogenide–based phototransistors with a photodetectivity of >1013 Jones and seven-stage ring oscillators operating at a speed of ~2.6 MHz (propagation delay of < 27 ns per stage) are demonstrated.
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