| 초록 |
Carbon nanotubes (CNTs) have very attractive properties for solar cells. Their suitable electronic levels, high electric conductivity, and unusual aspect ratio produce the two beneficial effects: (i) the formation of efficient electronic energy structures and (ii) the reduction of interfacial resistance. However, they may not be sufficient to fully explain the significant improvement that is observed. In particular, CNTs are well-known as materials to enhance the electrical field . Therefore, we explore the effect of the CNT layers by measuring the reverse-FE currents and the significant increase in the β value (i.e. the field enhancement factor) that are observed. In addition to these two effects, the enhancement of the electrical field by the CNT layers in solar cells should be considered as another potentially important factor contributing to the improvement of their efficiency. To demonstrate the hypothesis, the superstrate-type Cu(In,Ga)Se2 (CIGS) solar cell. |
