Air-Stable and Efficient PbSe Quantum-Dot Solar Cells Based upon ZnSe to PbSe Cation-Exchanged Quantum Dots

作者：Kim Sungwoo; Marshal Ashley R; Kroupa Daniel M; Miller Elisa M; Luther Joseph M; Jeong Sohee; Beard Matthew C

来源：ACS Nano, 2015, 9(8): 8157-8164.

DOI：10.1021/acsnano.5b02326

• quantum dots
• cation exchange
• halide passivation
• PbSe QDs
• solar cells

We developed a single step, cation-exchange reaction that produces air-stable PbSe quantum dots (QDs) from ZnSe QDs and PbX2 (X = Cl, Br, or I) precursors. The resulting Pb Se QDs are terminated with halide anions and contain residual Zn cations. We characterized the Pb Se QDs using UV-vis-NIR absorption, photoluminescence quantum yield spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and transmission electron microscopy. Solar cells fabricated from these PbSe QDs obtained an overall best power conversion efficiency of 6.47% at one sun illumination. The solar cell performance without encapsulation remains unchanged for over 50 days in ambient conditions; and after 50 days, the National Renewable Energy Laboratory certification team certified the device at 5.9%.

• 出版日期2015-8