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Improving the stability of perovskite solar cells under harsh environmental conditions
摘要： In this work, it is reported for the ?rst time the synthesis of high-purity Lead Sul?de (PbS) quantum dot (QD) using the nano-emulsion method assisted by an ultrasonic bath, which was tested as a hole transporting material (HTM) in perovskite devices. Further, these PbS QDs were introduced in CH3NH3PbI3 based perovskite device, between the perovskite layer and the HTM to enhance its stability against humidity. The hydrophobic nature of the PbS protects the perovskite by preventing the di?usion of water into the device. To compare the e?ect, the perovskite devices with and without the layer of PbS QDs were tested under high humidity conditions (~70%) without encapsulation. The pristine perovskite devices completely degraded after a span of 10 days, whereas the devices with PbS QDs showed huge resistance to humidity by retaining 76% of its initial e?ciency after a span of 60 days. Such enhanced stability under adverse environmental conditions has never been reported. Also, these results would open up a new insight of PbS QDs being utilized as a barrier against high humid conditions for making air-stable devices.
关键词： Stability,Quantum dots,Humidity,Perovskite,Lead sul?de,Nano-emulsion
更新于2025-09-23 15:21:01
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High Sensitivity Hybrid PbS CQD-TMDC Photodetectors up to 2 μm
摘要： Recent approaches to develop infrared photodetectors characterized by high sensitivities, broadband spectral coverage, easy integration with silicon electronics, and low cost have been based on hybrid structures of transition metal dichalcogenides (TMDCs) and PbS colloidal quantum dots (CQDs). However, to date, such photodetectors have been reported with high sensitivity up to 1.5 μm. Here we extend the spectral coverage of this technology toward 2 μm, demonstrating for the ?rst time compelling performance with responsivities 1400 A/W at 1.8 μm with 1 V bias and detectivities as high as 1012 Jones at room temperature. To do this, we studied two TMDC materials as a carrier transport layer, tungsten disul?de (WS2), and molybdenum disul?de (MoS2) and demonstrate that WS2-based hybrid photodetectors outperform those of MoS2 due to a more adequate band alignment that favors carrier transfer from the CQDs.
关键词： quantum dots,tungsten sul?de,infrared photodetectors,lead sul?de,molybdenum sul?de,two-dimensional materials
更新于2025-09-16 10:30:52