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

PVMD

Delft University of Technology

CPV- Light concentration effects

Arno Smets

Learning objectives

Effect of light concentration on the

• Short circuit current density (JSC)
• Open circuit voltage (VOC)
• Fill Factor (FF)

Courtesy: NREL

Courtesy: NREL

concentrator Non-concentrator

Open circuit voltage

Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

( )

OC OC ln

V V C

* »

×

ph OC

ln 1 J kT V q J æ ö = + ç ÷ è ø

SC SC

J J C

* =

×

SC OC in

J V FF I h × × =

ph OC

ln 1 kT V q J J æ ö = + ç ÷ è ø

Open circuit voltage

Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

( )

OC OC ln

V V C

* »

×

ph OC

ln 1 J kT V q J æ ö = + ç ÷ è ø

SC SC

J J C

* =

×

ph OC

ln 1 kT V q J J æ ö = + ç ÷ è ø

( ) ( )

SC OC in

J V F I C C F h × × × × =

Open circuit voltage

Courtesy of M. Steiner, NREL and F. Dimroth, Fraunhofer ISE

( )

OC OC ln

V V C

* »

×

ph OC

ln 1 J kT V q J æ ö = + ç ÷ è ø

SC SC

J J C

* =

×

ph OC

ln 1 kT V q J J æ ö = + ç ÷ è ø

( ) ( ) ( )

SC OC in

ln C C J V FF I C h × × × = × ×

Open circuit voltage

J (mA/cm2) Voltage (V)

( )

OC OC ln

V V C

* »

×

SC SC

J J C

* =

×

ph OC

ln 1 kT V q J J æ ö = + ç ÷ è ø

( ) ( ) ( )

SC OC in

ln C C J V FF I C h × × × = × ×

1 sun 2 sun

+

• +
• +

Recombination mechanisms

Shockley-Read-Hall Radiative Auger Direct bandgap materials :

n p

C C b + ?

>>

Concentrated cells performance

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

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

• 400
• 300
• 200
• 100

100 200 Voltage [V] Current Density [A/m2] VOC RS = 0 Ohm RS = 2.5 Ohm RS = 5 Ohm RS = 7.5 Ohm RS = 10 Ohm

Increasing RS

Concentrated cells performance

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