Abstract
Often key to boosting photovoltages in photoelectrochemical and related solar-energy-conversion devices is the preferential slowing of rates of charge recombination-especially recombination at semiconductor/solution, semiconductor/polymer, or semiconductor/perovskite interfaces. In devices featuring TiO2 as the semiconducting component, a common approach to slowing recombination is to install an ultrathin metal oxide barrier layer or trap-passivating layer atop the semiconductor, with the needed layer often being formed via atomic layer deposition (ALD). A particularly promising barrier layer material is Nb2O5. Its conduction-band-edge potential ECB is low enough that charge injection from an adsorbed molecular, polymeric, or solid-state light absorber and into the semiconductor can still occur, but high enough that charge recombination is inhibited. While a few measurements of ECB have been reported for conventionally synthesized, bulk Nb2O5, none have been described for ALD-fabricated versions. Here, we specifically determine the conduction-band-edge energy of ALD-fabricated Nb2O5 relative to that of TiO2. We find that, while the value for ALD-Nb2O5 is indeed higher than that for TiO2, the difference is less than anticipated ...Continue Reading
References
Jul 21, 2006·The Journal of Physical Chemistry. B·Alex N M GreenJames R Durrant
Apr 2, 2009·Journal of the American Chemical Society·Sara E KoopsJames R Durrant
Sep 14, 2010·Chemical Reviews·Anders HagfeldtHenrik Pettersson
May 21, 2011·ACS Nano·Priti TiwanaLaura M Herz
Nov 17, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Gayatri NatuYiying Wu
Mar 21, 2012·Nano Letters·Adam F HalversonArthur J Frank
Jun 2, 2012·Journal of the American Chemical Society·Ho-Jin SonJoseph T Hupp
Nov 17, 2012·ACS Applied Materials & Interfaces·Hye-Na Kim, Jun Hyuk Moon
Dec 19, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Michael J KatzJoseph T Hupp
Sep 27, 2013·Accounts of Chemical Research·Aron Walsh, Keith T Butler
Oct 24, 2013·Journal of the American Chemical Society·Chaiya PrasittichaiJoseph T Hupp
May 28, 2014·Angewandte Chemie·Cunku DongLeone Spiccia
Aug 2, 2014·Science·Huanping ZhouYang Yang
Oct 4, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Nafiseh SharifiNima Taghavinia
Oct 29, 2014·ACS Applied Materials & Interfaces·Soumyo ChatterjeeAmlan J Pal
Jan 30, 2015·Chemical Reviews·Jihuai WuGenggeng Luo
Apr 23, 2015·ACS Applied Materials & Interfaces·Yongzhen WuMichael Grätzel
Jul 1, 2015·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Stephan Lany
Jun 14, 2016·ACS Applied Materials & Interfaces·Nicholas S McCoolThomas E Mallouk
Nov 4, 2016·Journal of the American Chemical Society·Yasemin SaygiliMarina Freitag
Dec 10, 2016·The Journal of Physical Chemistry Letters·Yao YaoHaibo Ma
Mar 16, 2017·Journal of the American Chemical Society·R Clayton ShallcrossNeal R Armstrong