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P-type Charge Transport and Selective Gas Sensing of All-Inorganic Perovskite Nanocrystals
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-09-18 , DOI: 10.1021/acsmaterialslett.0c00346 Jiyun Kim 1 , Long Hu 1 , Hongjun Chen 2 , Xinwei Guan 1 , Pradeep Raja Anandan 1 , Feng Li 3 , Jianbo Tang 4 , Chun-Ho Lin 1 , Kourosh Kalantar-Zadeh 4 , Antonio Tricoli 2 , Tom Wu 1
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-09-18 , DOI: 10.1021/acsmaterialslett.0c00346 Jiyun Kim 1 , Long Hu 1 , Hongjun Chen 2 , Xinwei Guan 1 , Pradeep Raja Anandan 1 , Feng Li 3 , Jianbo Tang 4 , Chun-Ho Lin 1 , Kourosh Kalantar-Zadeh 4 , Antonio Tricoli 2 , Tom Wu 1
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The remarkable optoelectronic property of all-inorganic halide perovskite nanocrystals (NCs) has inspired the exploration of these materials for a wide range of applications. However, the low conductivity of perovskite NCs thin film is regarded as the Achilles’ heel, hindering further development in electronic usage. To address this issue, we employed sequential treatments of methyl acetate soft soaking and Ostwald ripening on CsPbBr3 NC thin films, which improve the transport property and dramatically enhance the carrier lifetime from 11.56 to 112.5 ns. The field-effect transistor (FET) based on resulting CsPbBr3 NCs thin film exhibits p-type carrier mobility of 0.023 cm2 V–1 s–1 and ON/OFF ratio up to ∼104, which is on par with the bulk perovskite-based FETs. Furthermore, as a proof of concept, we demonstrate that the p-type CsPbBr3 NCs feature high gas-sensing selectivity to detect NO2 with a detection limit down to 0.4 ppm. The appealing charge-transport properties of these CsPbBr3 NCs underscore their potentials for versatile applications.
中文翻译：
全无机钙钛矿纳米晶体的P型电荷传输和选择性气体传感
全无机卤化物钙钛矿纳米晶体（NC）的非凡的光电性能激发了对这些材料进行广泛应用的探索。然而，钙钛矿NCs薄膜的低电导率被认为是致命弱点，阻碍了电子应用的进一步发展。为解决此问题，我们在CsPbBr 3 NC薄膜上采用了乙酸甲酯软浸和Ostwald熟化的顺序处理，从而改善了传输性能并将载流子寿命从11.56 ns大幅提高至112.5 ns。基于所得的CsPbBr 3 NCs薄膜的场效应晶体管（FET）表现出0.023 cm 2 V –1 s –1的p型载流子迁移率，开/关比最高可达〜10图4与基于钙钛矿的整体FET相当。此外，作为概念证明，我们证明了p型CsPbBr 3 NC具有高的气敏选择性，可检测低至0.4 ppm的NO 2。这些CsPbBr 3 NC具有吸引人的电荷传输特性，突显了其在多种应用中的潜力。
更新日期：2020-11-02
中文翻译：
全无机钙钛矿纳米晶体的P型电荷传输和选择性气体传感
全无机卤化物钙钛矿纳米晶体（NC）的非凡的光电性能激发了对这些材料进行广泛应用的探索。然而，钙钛矿NCs薄膜的低电导率被认为是致命弱点，阻碍了电子应用的进一步发展。为解决此问题，我们在CsPbBr 3 NC薄膜上采用了乙酸甲酯软浸和Ostwald熟化的顺序处理，从而改善了传输性能并将载流子寿命从11.56 ns大幅提高至112.5 ns。基于所得的CsPbBr 3 NCs薄膜的场效应晶体管（FET）表现出0.023 cm 2 V –1 s –1的p型载流子迁移率，开/关比最高可达〜10图4与基于钙钛矿的整体FET相当。此外，作为概念证明，我们证明了p型CsPbBr 3 NC具有高的气敏选择性，可检测低至0.4 ppm的NO 2。这些CsPbBr 3 NC具有吸引人的电荷传输特性，突显了其在多种应用中的潜力。
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