Highly efficient inverted organic photovoltaics using solution based titanium oxide as electron selective contact

The challenge to reversing the layer sequence of organic photovoltaics (OPVs) is to prepare a selective contact bottom cathode and to achieve a suitable morphology for carrier collection in the inverted structure. The authors report the creation of an efficient electron selective bottom contact based on a solution-processed titanium oxide interfacial layer on the top of indium tin oxide. The use of o-xylene as a solvent creates an efficient carrier collection network with little vertical phase segregation, providing sufficient performance for both regular and inverted solar cells. The authors demonstrate inverted layer sequence OPVs with AM 1.5 calibrated power conversion efficiencies of over 3%.

[1]  Vishal Shrotriya,et al.  Efficient inverted polymer solar cells , 2006 .

[2]  Christoph J. Brabec,et al.  Design Rules for Donors in Bulk‐Heterojunction Solar Cells—Towards 10 % Energy‐Conversion Efficiency , 2006 .

[3]  A. J. Heeger,et al.  Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene , 1992, Science.

[4]  Donal D. C. Bradley,et al.  Device annealing effect in organic solar cells with blends of regioregular poly(3-hexylthiophene) and soluble fullerene , 2005 .

[5]  D. Bradley,et al.  Investigation of transport properties in polymer/fullerene blends using time-of-flight photocurrent measurements , 2003 .

[6]  Michael Niggemann,et al.  Organic solar cells using inverted layer sequence , 2005 .

[7]  J. Hummelen,et al.  Polymer Photovoltaic Cells: Enhanced Efficiencies via a Network of Internal Donor-Acceptor Heterojunctions , 1995, Science.

[8]  Yang Yang,et al.  High-efficiency solution processable polymer photovoltaic cells by self-organization of polymer blends , 2005 .

[9]  Christoph J. Brabec,et al.  Physics of organic bulk heterojunction devices for photovoltaic applications , 2006 .

[10]  Donal D. C. Bradley,et al.  A strong regioregularity effect in self-organizing conjugated polymer films and high-efficiency polythiophene:fullerene solar cells , 2006 .

[11]  Xiong Gong,et al.  New Architecture for High‐Efficiency Polymer Photovoltaic Cells Using Solution‐Based Titanium Oxide as an Optical Spacer , 2006 .

[12]  David L Carroll,et al.  Meso-structure formation for enhanced organic photovoltaic cells. , 2005, Organic letters.

[13]  Christoph J. Brabec,et al.  Production Aspects of Organic Photovoltaics and Their Impact on the Commercialization of Devices , 2005 .

[14]  C. A. Walsh,et al.  Efficient photodiodes from interpenetrating polymer networks , 1995, Nature.

[15]  Christoph J. Brabec,et al.  Alternative device concepts for future requirements of organic photovoltaic cells , 2006, SPIE Optics + Photonics.

[16]  Jean-Michel Nunzi,et al.  Development of air stable polymer solar cells using an inverted gold on top anode structure , 2005 .