Photovoltaic  Windows  for  Green  Building  Giacomo  Mariani,  Joshua  Shapiro  UCLA  Integrated  NanoMaterials  Laboratory,  Prof.  Diana  Huffaker  

Pillars  Transferred  to  Transparent  Polymer  

Nanopillar  Sample  

Embedded  in  Polymer  

Hybrid  Nanopillar/Polymer  PhotoVoltaic  

Photoluminescence*  of  Nanopillars  in  Polymer  

Without  Pump  Filter  

With  Pump  Filter  

*Pump  Source:  402nm  Laser  

Pillars  transferred  to  polymer  are  •  Flexible  •  Transparent  •  Exhibit  Strong  Photo-­‐Response  

IniRal  Results  for  Hybrid  Nanopillar  PV  •  Low  Leakage  Currents  •  Fill  Factors    >  40%  •  Solar  Conversion  Efficiency  1-­‐2%  

Nanopillars  Coated  with  P3HT  (semiconducFng  polymer)  

Nanopillar  Coated  with  P3HT  and  ITO  (Indium  Tin  Oxide)  

Etch  Back  Polymer  

Gallium  Arsenide   ConducFng  polymer   InsulaFng  polymer  

Drop-­‐Cast  ConducFng  Polymer  

Remove  From  Substrate  

Original  Nanopillar    Sample  

Spin  Coat  InsulaFng  Polymer  

Spin  Coat    ConducFng  Polymer  

•  A  Gallium  Arsenide  P-­‐N  JuncRon  converts  light            into  electricity  •  Transparent  ConducRng  polymer  contacts  to  extract  carriers  

•  PotenRal  to  reuse  gallium-­‐arsenide  substrate  •  High  carrier  mobility  in  GaAs  •  Low  carrier  mobility  in  polymer  •  Average  of  ~  1trillion  nanopillars/m2