Daniel Friedman is a researcher and the photovoltaics subprogram lead at NREL, where he has contributed to the development of next-generation multijunction high-efficiency solar cells; thermophotovoltaic devices for energy storage and other thermal energy harvesting applications; receivers for laser power conversion; and the performance characterization of emerging solar cell technologies.

Featured Work

Thermophotovoltaic Efficiency of 40%Nature (2021)

How Useful Are Conventional I-Vs for Performance Calibration of Single and Two-Junction Perovskite Solar Cells? A Statistical Analysis of Performance Data on ~200 Cells from 30 Global SourcesSolar Rapid Research Lett. (2021)

Design of Thermophotovoltaic Cells for Optimal System Efficiency, Accounting for Photon Reuse from Front and Back ContactsIEEE 46th Photovoltaic Specialists Conference (2019)

Effect of Luminescent Coupling on the Optimal Design of Multijunction Solar CellsIEEE J. Photovolt. (2014)

Analysis of Multijunction Solar Cell Current-Voltage Characteristics in the Presence of Luminescent Coupling, IEEE J. Photovolt.(2013)

High-Efficiency III-V Multijunction Solar CellsHandbook of PV Science and Engineering 2nd Edition (2011)

Progress and Challenges for Next-Generation High-Efficiency Multijunction Solar CellsCurr. Opin. Sol. State Mater. Sci (2010)

0.7-eV GaInAs Junction for a GaInP/GaAs/GaInAs(1 eV)/GaInAs(0.7 eV) Four-junction Solar Cell, IEEE 4th World Conference on Photovoltaic Energy Conference (2006)

1-eV Solar Cells with GaInNAs Active LayerJournal of Crystal Growth (1998)

Modeling of Tandem Cell Temperature Coefficients, IEEE  25th Photovoltaic Specialists Conference (1996)