PVMD Delft University of Technology Learning objectives Effect of - PowerPoint PPT Presentation

CPV- Light concentration effects Arno Smets PVMD Delft University of Technology

Learning objectives Effect of light concentration on the Short circuit current density (J SC ) • Open circuit voltage (V OC ) • Fill Factor (FF) •

Courtesy: NREL

concentrator Non-concentrator Courtesy: NREL

Open circuit voltage × × J V FF h = SC OC I in * = × J J C SC SC æ æ ö ö J J kT kT ph ph = = + + V V ln ln 1 1 ç ÷ ç ÷ OC OC q q J J è è ø ø 0 0 * » ( ) × V V OC ln C OC Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

Open circuit voltage ( ) × × × J C V F F h = SC OC ( ) × I C in * = × J J C SC SC æ æ ö ö J J kT kT ph ph = = + + V V ln ln 1 1 ç ÷ ç ÷ OC OC q q J J è è ø ø 0 0 * » ( ) × V V OC ln C OC Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

Open circuit voltage ( ) ( ) × × × × J C V ln C FF h = SC OC ( ) × I C in * = × J J C SC SC æ æ ö ö J J kT kT ph ph = = + + V V ln ln 1 1 ç ÷ ç ÷ OC OC q q J J è è ø ø 0 0 * » ( ) × V V OC ln C OC Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

Open circuit voltage 2 sun ( ) ( ) × × × × J C V ln C FF h = SC OC ( ) × I C J (mA/cm 2 ) in * = × J J C SC SC 1 sun æ ö J kT ph = + V ln 1 ç ÷ OC q J è ø 0 * » ( ) × V V OC ln C OC Voltage (V)

Recombination mechanisms Radiative Auger Shockley-Read-Hall - - - - - - + + + Direct bandgap materials : b + >> C C ? n p

Concentrated cells performance 200 R S = 0 Ohm R S = 2.5 Ohm R S = 5 Ohm 100 Current Density [A/m 2 ] R S = 7.5 Ohm R S = 10 Ohm 0 Increasing R S -100 -200 -300 V OC -400 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Voltage [V] Courtesy: IEEE PVSC-40 tutorial, June 8, 2014 by M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

Concentrated cells performance Courtesy: IEEE PVSC-40 tutorial, June 8, 2014 by M. Steiner, NREL and F. Dimroth, Fraunhofer ISE