Improved efficiency of quantum dot sensitized solar cells based on TiO2/ rGO/TiO2 photoanode

While quantum dot sensitized solar cells (QDSSCs) have attracted great attention, the power conversion efficiency is still far from theoretical value. To address this issue, in present work, we introduced reduced graphene oxide (rGO) into the QDSSC photoanode, and prepared TiO2/rGO/TiO2 photoanode structure. Due to the excellent conductivity of rGO, we optimized the built-in electric field in the electrode, and improved the ability for extraction, collection, and transfer of photogenerated electrons of the photoanode. Compared with cells without rGO inserting layer, the power conversion efficiency of cells based on TiO2/rGO/TiO2 photoanodes is enhanced from 2.86% to 4.03%. This work provides a way for enhancing performance of QDSSCs.

Automated summary

This study introduced rGO into QDSSC photoanodes to enhance performance by optimizing the built-in electric field in the electrode, leading to a significant improvement in power conversion efficiency.