Multiphoton Absorption Stimulated Metal Chalcogenide Quantum Dot Solar Cells under Ambient and Concentrated Irradiance
Multiphoton Absorption Stimulated Metal Chalcogenide Quantum Dot Solar Cells under Ambient and Concentrated Irradiance
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DOI：
10.1002/adfm.202004563
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发表时间：
2020-08-11
影响因子：
19
通讯作者：
Kim, Jong Min
中科院分区：
文献类型：
--
作者：
Hou, Bo;Kim, Byung-Sung;Kim, Jong Min
胶体金属硫系量子点在光-物质相互作用中具有优异的量子效率和良好的器件稳定性。然而，量子点已经成为自下而上组装半导体器件中可行的构建模块，与其他量子点技术相比，量子点太阳能电池（QDSC）的发展仍然面临着相当大的挑战，因为它们在自然阳光下的性能较低，这是由于它们的量子态密度和无机性质尚未开发的潜力。本报告旨在通过访问在室内和集中式光伏（CPV）应用中使用QDSC的可行性来解决这一长期存在的挑战。本研究发现，QD固体的以上带隙光子能量辐照可以通过多光子吸收（MPA）产生高密度的激子，并且这些激子不限于通过俄歇复合扩散到1.5 x 10(19) cm（-3）密度。基于这些发现，普通qdsc可以轻松实现19.5%（2000勒克斯室内光）和11.6%（1.5个太阳）的效率（1个太阳下9.55%）。为了进一步说明MPA在qdsc中的潜力，已经证明了21.29%效率的聚合物透镜cpv（4.08太阳）和由室内qdsc矩阵供电的可行传感器网络。
Colloidal metal chalcogenide quantum dots (QDs) have excellent quantum efficiency in light-matter interactions and good device stability. However, QDs have been brought to the forefront as viable building blocks in bottom-up assembling semiconductor devices, the development of QD solar cell (QDSC) is still confronting considerable challenges compared to other QD technologies due to their low performance under natural sunlight, as a consequence of untapped potential from their quantized density-of-state and inorganic natures. This report is designed to address this long-standing challenge by accessing the feasibility of using QDSC for indoor and concentration PV (CPV) applications. This work finds that above bandgap photon energy irradiation of QD solids can generate high densities of excitons via multi-photon absorption (MPA), and these excitons are not limited to diffuse by Auger recombination up to 1.5 x 10(19) cm(-3) densities. Based on these findings, a 19.5% (2000 lux indoor light) and an 11.6% efficiency (1.5 Suns) have been facilely realized from ordinary QDSCs (9.55% under 1 Sun). To further illustrate the potential of the MPA in QDSCs, 21.29% efficiency polymer lens CPVs (4.08 Suns) and viable sensor networks powered by indoor QDSCs matrix have been demonstrated.