| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1549634 | Solar Energy | 2015 | 8 Pages |
Abstract
The open-circuit voltage of CH3NH3PbI3 based photovoltaics was enhanced from 0.77 V to 0.9Â V, which resulted in an improvement of the average power conversion efficiency from 5.63% to 11.74% achieved by tuning the work function of the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transport layer. The higher work function of the PEDOT:PSS (1:20Â wt%) thin film, as compared to the PEDOT:PSS (1:6Â wt%) and PEDOT:PSS (1:2.5Â wt%) thin films, was observed using photoelectron spectrometer. The carrier density of PEDOT was obtained by analyzing the transmittance spectrum of PEDOT:PSS/glass with the transfer matrix method. The Drude model can be used to explain the increased work function of the PEDOT:PSS thin film obtained by decreasing the ratio of PEDOT to PSS. The increased carrier density of the PEDOT in PEDOT:PSS thin films originated from conformational changes in the PEDOT chains as confirmed by Raman scattering spectroscopy.
Related Topics
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Authors
Sheng Hsiung Chang, Kuen-Feng Lin, Kuo Yuan Chiu, Chia-Lung Tsai, Hsin-Ming Cheng, Shih-Chieh Yeh, Wen-Ti Wu, Wei-Nien Chen, Chin-Ti Chen, Sheng-Hui Chen, Chun-Guey Wu,