Non-hygroscopic poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) thin films for efficient bulkheterojunction solar cells
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We report that power conversion efficiency (PCE) of bulkheterojunction (BHJ) solar cells can be improved by incorporating non-hygroscopic poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films as hole transport layers (HTLs). By depositing ferric chloride solutions onto PEDOT:PSS thin films, they showed enhanced water resistance due to the formation of coordination bond between Fe3+ ions and hydroxyl functionalities of the PSS. Considering that hydroxyl functionalities can be trapping sites for mobile electrons, it is reasonable to expect reduced electron trap density adjacent to the Fe-PEDOT:PSS thin film. As a result, BHJ solar cells fabricated with the Fe-PEDOT:PSS HTLs produced enhanced PCEs compared to that of the solar cell using a pristine PEDOT:PSS HTL. These results demonstrate that effective passivation of hydroxyl functionalities can produce non-hygroscopic PEDOT:PSS thin films useful for the development of efficient BHJ solar cells.