Enhanced performance of all solid-state quantum dot-sensitized solar cells via synchronous deposition of PbS and CdS quantum dots

Abstract

The synchronous deposition of PbS and CdS affords band-structure tailoring and surface recombination passivation for efficient and stable solid-state QDSCs.

Near‐Infrared Photoactive Semiconductor Quantum Dots for Solar Cells

“…The in situ growth methods of SILAR and CBD receive extensive attention for QDSCs, especially for the fabrication of sensitized devices at the early stage of studies. [65][66][67] These two methods share the advantage of high loading amount of QDs, but suffer from the disadvantages of large size distribution and low crystallinity, which might aggravate the charge recombination in photovoltaic devices. [66] For this reason, the facile SILAR and CBD methods receive much attentions but the efficiency of resultant QDSCs remains stagnant at a moderate level of 6-7% for the past few years.…”

“…Meanwhile, since most of the sensitized devices involve the use of liquid electrolyte that suffers from the poor device stability, researchers are trying to construct all solid-state QDSCs by using solid-state hole transport materials to replace liquid electrolytes. [65] The device architecture of solar cells significantly impacts the photovoltaic performance. Among various configurations, QDSCs utilizing heterojunction and sensitization structures attract more attention.…”

“…), have also been explored. [65,201,239] Particularly, conjugated polymer semiconductors attracted great attention in recent years due to their highly tunable optoelectronic properties and processability. [83,240] For instance, organic π-conjugated polymers (π-CPs) that exhibit substantially enhanced HTL performance compared with p-type CQDs was used in QDSCs to deliver a remarkable PCE of 13.03%, higher than that of 11.33% for the device based on p-type CQDs, due to the improved charge extraction efficiency near the CQD/HTL interface.…”