University of Michigan

University of Southern California

Forrest, Stephen R.

Panda, Anurag

Zimmerman, Jeramy D.

Xiao, Xin

Che, Xiaozhou

Lassiter, Brian E.

Bergemann, Kevin

Xiaozhou Che

Stephen R Forrest

Xin Xiao

Kevin Bergemann

Anurag Panda

Cong Trihn

Brian E Lassiter

Andrew N Bartynski

A highly efficient multi junction photovoltaic device, such as a two, three, or four junction device, is disclosed. The multi-junction device may include a first subcell comprising a first photoactive region and a second subcell comprising a second photoactive region. The first and second photoactive regions are designed to minimize spectral overlap and maximize photocurrent across a broad absorption spectra, such as wavelengths ranging from 400 nm to 900 nm. The device may further include an inter-connecting layer, disposed between the first subcell and the second subcell, that is at least substantially transparent. By introducing a transparent interconnecting layer, a dual element (tandem) cell achieves a power conversion efficiency of 10.0&#xb1;0.5%. By adding an additional (3) sub-cell that absorbs at the second order optical interference maximum within the stack. The triple junction cell significantly improves the quantum efficiency at shorter wavelengths, achieving a power conversion efficiency of 11.1&#xb1;0.5%. Adding additional sub-cells has been shown to increase power conversion efficiency above 12%.

Highly efficient small molecule multi-junction organic photovoltaic cells

High efficiency multi-junction small-molecule organic photovoltaic devices and methods of fabricating the same are disclosed herein. Design considerations for improving spectral coverage and light-harvesting efficiency using the multi-junction devices are also disclosed.

High efficiency multi-junction small-molecule photovoltaic devices

A high efficiency small molecule tandem solar cell is disclosed. The tandem cell may include a first subcell comprising a first photoactive region and a second subcell comprising a second photoactive region. The first and second photoactive regions are designed to minimize spectral overlap and maximize photocurrent. The device may further include an interconnecting layer, disposed between the first subcell and the second subcell, that is at least substantially transparent.

High efficiency small molecule tandem photovoltaic devices

Growing community of inventors

Ann Arbor, MI, United States of America

Xiaozhou Che