Photocurrent Enhancement in Polythiophene- and Alkanethiol-Modified ZnO Solar Cells


  • The authors wish to acknowledge N. Archuleta and E. Fish for their technical assistance. The work was supported by the Sandia LDRD program and by the Division of Material Sciences and Engineering, Office of Basic Energy Sciences, U.S. Department of Energy under Contract no. DE-AC04-94AL85000. Supporting Information is available online from Wiley InterScience or from the author.


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Photocurrent enhancement and improvement in solar cell performance are found when the interface between ZnO and polythiophene layers is modified with insulating alkanethiol self-assembled monolayers. This result is correlated with increased structural order in the polymer and interchain contributions in the photocurrent, suggesting that improved exciton diffusion or reduced electron-hole recombination can outweigh the impedance in electron transfer at the heterojunction interface.