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Light harvesting in hybrid epitaxial/colloidal nanostructures

机译:外延/胶体纳米混合结构中的光收集

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The performance of light harvesting devices is improved by utilising resonance energy transfer. A hybrid structure of colloidal quantum dots (QDs) and a quantum well (QW) p-i-n heterostructure is investigated. After highly absorbing QDs absorb photons, the excitations are efficiently transferred to a QW p-i-n heterostructure via resonance energy transfer. The generated electron-hole pairs in the heterostructure are subsequently separated by the built-in electric field and collected by the corresponding electrodes. In order to increase the energy transfer rate, the donor-acceptor separation distance is minimised by fabricating channel structures on the heterostructure surface penetrating its active layers. Consequently, a six-fold enhancement of photocurrent conversion efficiency is demonstrated. The proposed hybrid structures offer efficient light harvesting devices where high absorption of the colloidal QDs is utilised and their low charge transfer is overcome.
机译:通过利用共振能量转移来改善光收集装置的性能。研究了胶体量子点(QDs)和量子阱(QW)p-i-n异质结构的混合结构。在高度吸收的QD吸收光子后,激发通过共振能量转移有效地转移到QW p-i-n异质结构。异质结构中产生的电子-空穴对随后被内建的电场分开并被相应的电极收集。为了增加能量传递速率,通过在穿透其活性层的异质结构表面上制造沟道结构来使供体-受体分离距离最小化。因此,证明了光电流转换效率提高了六倍。所提出的混合结构提供了有效的光收集装置,其中利用了胶体量子点的高吸收并且克服了它们的低电荷转移。

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