Stable Schottky Solar cells from Pbs Nanocrystals

Jiang Tang

The Edward S. Rogers Sr. Department of Electrical and Computer Engineering (Photonics)

Abstract:

Quatumn dots solar cells holds great potential for large-scale, low-cost roll-by-roll manufacture because of their solution-processing and compatible with flexible substrates. Rapid progress have been obtained in this field and AM1.5G ( 1 sun) power conversion efficiency of 3.3% have been reported. However, all of these devices suffer from immediate failure upon brief air exposure. Here we first developed a layer-by-layer spin-coating technique to fabricate air-stable PbS films and compared the stability of small PbS nanocrystals vs large ones; then we engineered the Schottky contact and sandwiched a thin LiF layer between Pbs film and the Al electrode. Device performance and air-stability were improved simultaneously and an air-stable device with 2.2% AM1.5G power conversion efficiency was demonstrated.

Biography:

Jiang Tang received his bachelor's degree in Chemistry from University of Science and Technology of China, Hefei, Anhui, P.R. China. He obtained his Master degree in Analytical Chemistry from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences in 2006.  Started from Jan. 2007, Jiang is a Ph.D candidate in Department of MaterialS Science and Engineering, University of Toronto, under the supervision of Prof. Edward H. Sargent. His research is focused in low-cost, solution-processed, nanocrystals-based photoconductive photodetectors and solar cells.