Detail: | Abstract:
Among numerous photovoltaic (PV) technology candidates with various materials and architecture systems to address the issues of providing affordable and clean solar energy, multi-junction solar cells (MJSC) become the first choice owing to their unique advantages, including high photovoltage, reduced carrier thermalization loss, and high efficiency potentials, which also enable their particular applications in household and industrial scales. MJSCs based on the earth-abundant element, silicon, can further open reliable pathways to achieve the goal. We herein report our latest progress in fabricating high-performing MJSCs. After combining with the single-junction sub-cells and optimizing the current-matching, an outstanding initial efficiency of 10.3% (Voc=1.96V), 11.63% (Voc=1.75V), 13.65% (Voc=1.39V), and 14.26% (Voc=1.52V) were respectively achieved for double-junction a-Si:H/a-Si:H, a-Si:H/a-SiGe:H, a-Si:H/μc-Si:H, a-Si:H/SHJ solar cells. Further based on the optimized low-loss tunnel recombination junctions to connect the sub-cells, higher performance triple-junction and quadruple-junction MJSCs with an initial efficiency of 16.07% (Voc=2.19V) and 15.03% (Voc=3.02V) were achieved for a-Si:H/a-SiGe:H/μc-Si:H and a-SiC:H/a-Si:H/a-SiGe:H/μc-Si:H solar cells, respectively. Besides the silicon MJSCs, new-type perovskite/SHJ tandem solar cells are also being developed. Keywords: solar cells, silicon, perovskite, Tandem |
