Xiaodan Zhang

Si-based Nanostructures

Nankai University

No. 38, Tongyan Road, Haihe Education Park, Jinnan District, Tianjin

Email: xdzhang@nankai.edu.cn  

Biography

   Xiaodan Zhang, Distinguished Professor and Doctoral Supervisor of Nankai University. Professor Xiaodan Zhang has won the China Young Female Scientist Award. Her research interests are mainly on silicon, perovskite, and perovskite/silicon tandem solar cells.

Abstract for Presentation

Two-Terminal Perovskite/Silicon Tandem Solar Cells

   Adhering to the important concept of promoting the green transformation of energy system and achieving the goals of peak carbon dioxide emissions and carbon neutrality, we have carried out a number of key research on photovoltaic power generation using solar energy. We focus on the preparation and improvement of two-terminal perovskite/crystalline silicon tandem solar cells (2T PK/c-Si-TSC). Compared with traditional single-crystalline silicon solar cells, PK/c-Si-TSC technology can make more full use of the solar spectrum and break the Shockley-Queiser photoelectric efficiency limit in single-junction cells, in which the two-terminal structure has better potential for photoelectric conversion due to fewer transparent electrodes.

   Here, we will briefly introduce the development of 2T PK/c-Si-TSC in our team. Starting from the first N-I-P structured perovskite single-junction cell prepared in 2014, the conversion efficiency of this structure has reached more than 24% in 2022. The conversion efficiency of N-I-P perovskite/silicon tandem cells based on this structure was improved from 18.81% in 2017 to 25.42% in 2021, while achieving a high open circuit voltage above 1.9V. On the other hand, since the P-I-N structured perovskite top cell can avoid the serious parasitic absorption problem caused by the hole transport layer, we developed an evaporation-solution hybrid two-step technique to prepare P-I-N perovskite solar cells, and conformally construct P-I-N structured 2T PK/c-Si-TSCs on fully-textured silicon heterojunction cells. The fully-textured structure of the substrate can provide more efficient light harvesting capability and lower process cost, and is compatible with current and future industrialization routes. A conversion efficiency of 27.48% was finally announced in 2021, and the device was stable in a nitrogen environment for more than 10,000 hours.

Figure 1. Recent progress in the research on tandem cells of the Institute of Photoelectronic Thin Film Devices and Technology.