Of interest for both photovoltaic and photodetector applications is the ability of colloidal quantum dot (CQD) devices to provide response further into the infrared than is typical for other solution-processable materials. Here, we present a simple heterojunction diode structure that utilizes the extended infrared absorption of PbS CQDs. We show that device performance benefits from a discontinuous exciton blocking layer which improves charge separation without limiting charge extraction. By enhancing charge carrier mobility in the CQD layer, we demonstrate a planar heterostructure device with a power conversion efficiency of 5.2% under 1 sun illumination.
Planar PbS quantum dot/C-60 heterojunction photovoltaic devices with 5.2% power conversion efficiency
Klem, E., Gregory, C., Cunningham, G., Hall, S., Temple, D., & Lewis, J. (2012). Planar PbS quantum dot/C-60 heterojunction photovoltaic devices with 5.2% power conversion efficiency. Applied Physics Letters, 100(17), . https://doi.org/10.1063/1.4707377