title: Parallel Pool Analysis of Transient Spectroscopy Reveals Origins of and Perspectives for ZnO Hybrid Solar Cell Performance Enhancement Using Semiconducting Surfactants.
abstract: Recently, the performance of ZnO nanocrystals as an electron acceptor in a solar cell device was significantly increased by a semiconducting surfactant. Here we show, using transient absorption spectroscopy and a parallel pool analysis, that changes in the quantum efficiency of charge generation account for the performance variation among semiconducting-surfactant-coated, surfactant-coated, and uncoated ZnO nanoparticles. We demonstrate that even better surfactant design to suppress fast recombination could still lead to a further doubling of device efficiency.
authors: §Max Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany.
authors: Michael
authors: M
authors: Meister
authors: †School of Electrical and Computer Engineering, Interuniversity Semiconductor Research Center and Center for Multiscale Energy System, Seoul National University, Seoul 151-744, South Korea.|‡Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
authors: Jason J
authors: JJ
authors: Amsden
authors: §Max Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany.
authors: Ian A
authors: IA
authors: Howard
authors: ‡Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
authors: Insun
authors: I
authors: Park
authors: †School of Electrical and Computer Engineering, Interuniversity Semiconductor Research Center and Center for Multiscale Energy System, Seoul National University, Seoul 151-744, South Korea.
authors: Changhee
authors: C
authors: Lee
authors: ‡Department of Chemistry, Seoul National University, Seoul 151-747, Korea.
authors: Do Y
authors: DY
authors: Yoon
authors: §Max Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, D-55128 Mainz, Germany.
authors: Frédéric
authors: F
authors: Laquai
keywords: hybrid solar cells; interface engineering; nanoparticles; photovoltaics; population kinetics; quantum efficiency