Ternary Composites with PbS Quantum Dots for Hybrid Photovoltaics

Abstract

Ternary hybrid photovoltaics based on polymers, fullerenes, and colloidal semiconductor quantum dots (QDs) bring together high efficiency and technological flexibility. To increase the performance of such hybrid solar cells, a thorough control over both film morphology and charge transport is required. In the present work, the morphology and optical properties of films of binary and ternary blends of PbS QDs with poly­(3-hexylthiophene-2,5diyl) and [6,6]-phenyl C71 butyric acid methyl ester have been investigated by steady-state and time-resolved photoluminescence spectroscopy, atomic force microscopy, and confocal laser-scanning microscopy. The influence of postdeposition and liquid-phase ligand exchange procedures on film properties has been considered. It is shown that the liquid-phase iodide passivation improves both film quality and charge-transfer efficiency. The mixture of three components facilitates charge transfer in the hybrid material, but a thorough control over QD size and ligand type is required.

PbS Quantum Dots with Inorganic Ligands: Physical Modeling of the Charge and Excitation Transport in Photovoltaic Cells

“…Layers of semiconductor colloidal quantum dots (CQDs), which are referred to here as CQD-solids, are quite promising for emerging photovoltaic (PV) cells. − Because of their capability of strong light absorption in a wide spectral range from UV to near-IR, PbS and PbSe CQDs can convert a significant part of the solar radiation spectrum into electrical energy. By varying only the size of CQD nanocrystals without changing the technology of their preparation, it is possible to flexibly adjust the energy levels of CQDs to the energy levels of other functional layers and electrodes, potentially providing efficient transport of charge carriers within the entire device.…”

Исследование Подвижности Носителей Заряда В Слоях Нанокристаллов PBS Методом Полевого Транзистора

“…В этом случае появление дополнительных фотоактивированных носителей может показать, что предположения относительно отсутствия электронной или дырочной проводимости преждевременны. Для этого мы проверили поведение образцов, обработанных EDT и TBAI, при освещении симулятором солнечного излучения на основе ксеноновой лампы [26].…”

Ligand-Assisted Formation of Graphene/Quantum Dot Monolayers with Improved Morphological and Electrical Properties

“…Then these substrates were covered by the QD and rGO-QD films. To detect light sensitivity, we used a halogen lamp (color temperature 2800 K) with a light intensity in the visible range of 3 W/m 2 [35].…”