Conduction mechanisms of P3HT: PCBM solar cell

In order to get a deeper understanding of the conduction mechanisms limiting the electrical characteristics of ITO/PEDOT:PSS/P3HT:PCBM/Al solar cells, dark current-voltage measurements at different temperatures were analyzed using a compact electrical equivalent circuit previously used in p/n junctions. Between 0.2 V and 0.6 V, the current-voltage characteristic is modeled by an exponential term which can be described by Multi-Tunneling Capture Emission process. For larger voltage, the model takes into account Space-Charge Limited process and series resistance. In addition, the model is useful to calculate the built in potential of the solar cell using only dark current-voltage-temperature measurements.

[1]  N. Tessler,et al.  Excitation density dependence of photocurrent efficiency in low mobility semiconductors , 2004 .

[2]  Christoph J. Brabec,et al.  Organic photovoltaics: technology and market , 2004 .

[3]  B. Mazhari,et al.  An improved solar cell circuit model for organic solar cells , 2006 .

[4]  X. Correig,et al.  Electrical characterization of n‐amorphous/p‐crystalline silicon heterojunctions , 1996 .

[5]  Christoph J. Brabec,et al.  Simulation of light intensity dependent current characteristics of polymer solar cells , 2004 .

[6]  Xavier Correig,et al.  Electrical model for amorphous/crystalline heterojunction silicon diodes (n a-Si:H/p c-Si) , 1996 .

[7]  X. Correig,et al.  ANALYSIS OF CONDUCTION MECHANISMS IN ANNEALED N-SI1-XCX:H/P.-CRYSTALLINE SI HETEROJUNCTION DIODES FOR DIFFERENT DOPING CONCENTRATIONS , 1999 .

[8]  Kazuhiro Saito,et al.  Origin of the open-circuit voltage of organic thin-film solar cells based on conjugated polymers , 2009 .

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

[10]  Juan Bisquert,et al.  Charge carrier mobility and lifetime of organic bulk heterojunctions analyzed by impedance spectroscopy , 2008 .

[11]  Jean-Pierre Charles,et al.  An equivalent circuit approach to organic solar cell modelling , 2008, Microelectron. J..

[12]  C. Brabec,et al.  Plastic Solar Cells , 2001 .

[13]  R. Schropp,et al.  A compact equivalent circuit for the dark current-voltage characteristics of nonideal solar cells , 2006 .

[14]  Temperature dependent characteristics of poly(3 hexylthiophene)-fullerene based heterojunction organic solar cells , 2003 .

[15]  Hideyo Okushi,et al.  Electrical properties of n-amorphous/p-crystalline silicon heterojunctions , 1984 .