| Nowadays, due to the shortage of energy on the earth, solar cell is considered as one of the choices to release this problem. Polymer solar cells have attracted much interest for the variety and low price of organic materials, simple fabricated process, easy realization of large-size and flexibility. However, the low efficiency of polymer solar cells is still a key problem to confine the commercial application of polymer solar cells, which is mainly due to the limited absorption of active materials in polymer solar cells to the solar energy (less than half of the solar energy to the ground).Highly efficient upconversion (UC) material NaYF4:2%Er3+,18%Yb3+, converting near-infrared (NIR) radiation into green and red emissions, is introduced into a bilayer P3HT/P3HT:[6,6] phenyl C61butyric acid methyl ester (PC61BM) device to compensate for the nonabsorbable wavelength zone of P3HT. The efficiency of this UC-modified bilayer polymer solar cell has been studied, with corresponding detailed analysis. With an optimal UC doping concentration of11.7%(weight ratio of UC to P3HT) into the P3HT matrix, the short-circuit current density (Jsc) and PCE for UC-doped bilayer cell are as high as10.89mA cm-2and3.62%, about16.6%and10.7%higher than the P3HT/P3HT:PC61BM bilayer cell and22.4%and16.4%higher than the standard heterojunction one, respectively. |
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