U C L A Polymer Solar Cells

• A cost effective renewable energy solution for future– Earth abundant, non-toxic & manufacturing friendly– Light weight power for portable electronics– Solution process for roll-to-roll manufacture– Tunable transparency & Color & Flexibility– Versatile applications

• Research Focus– New materials design & Synthesis– Morphology manipulation & Mechanism understanding– Interface & transparent electrode– Novel device architecture– New applications

U C L A

2005

2010

Controlling of Active Layer Growth Rate (4.4%)

2007

2009

2006Accurate Measurement and Characterization

Transition Metal Oxide as Buffer LayerInverted Structure

Anisotropy in Single-Crystal Photovoltaic

Highly Efficient Tandem CellsTransparent OPV

Advanced Functional Materials, 16, 2016 (2006)

Applied Physics Letters (2006)

Nature Materials, 4, 864 (2005)

2008

Low Bandgap Polymers

J. Am. Chem. Soc., 131, 15586 (2009)

World

Record

s: 6.8

7.68.13

8.62 10.6%

11.6%

Nature Photonics, 3, 649 (2009)

Advanced Materials, 21, 4238 (2009)

Advanced Materials, 21, 1 (2009)2-Terminal 3-Terminal

Applied Physics Letters (2006)

Solvent Annealing EffectAdvanced Functional Materials (2007)

Advanced Materials, 20, 435 (2008)

Semi-transparent Solar CellAdvanced Materials, 20, 415 (2008)

Solvent Mixture EffectAdvanced Materials, 18, 1783 (2008)

Vertical Phase SeparationAdvanced Functional Materials (2009)

Glass

ITO

PEDOT:PSS

C60

BCP

Al

Crystal

Glass

ITO

PEDOT:PSS

C60

BCP

Crystal

Glass

ITO

PEDOT:PSS

C60

BCP

Al

Crystal

GlassITO

PEDOT:PSS

C60BCP

Crystal

Al

2003 (<1%)

2012

Nature Photonics, 6, 180(2012) 2013

Nature Photonics, 6, 180(2012)

Nat. Communications, 4, 1446 (2013).

2014

ACS Nano, 2012

Achievements

U C L A

Glass

ITOCs2CO3

Polymer blend

TMOs

TCO

Glass/ITOZnO

WBG PolymerICL

LBG PolymerCathode

200nm

S

S

O

S

S

O

O n

S

S

S

S

N

NS

SO

O

n S

S

S

S

N

NSe

SeO

O

n

Material

Mechanism

Architecture

Application

Research Focus Areas