Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency

Authors
Kwon, JeongIm, Min JiKim, Chan UlWon, Sang HyukKang, Sung BumKang, Sung HoChoi, In TaekKim, Hwan KyuKim, In HoPark, Jong HyeokChoi, Kyoung Jin
Issue Date
2016-12
Publisher
Royal Society of Chemistry
Citation
Energy & Environmental Science, v.9, no.12, pp.3657 - 3665
Abstract
Tandem architectures using organic/inorganic hybrid semiconductors are a promising strategy to overcome the Shockley-Queisser limit of single-junction (SJ) solar cells as already demonstrated in III-V compound semiconductors. Here, we present a highly-efficient dye-sensitized solar cell (DSSC)/silicon (Si) monolithic tandem cell by utilizing PEDOT: FTS as an interfacial catalytic layer, which has higher transparency and lower charge-transfer resistance compared to conventional Pt. In addition, the amount of dye adsorbed on the surface of TiO2 nanoparticles is fine-tuned for precise current matching between the two sub-cells. Based on these rational approaches, the DSSC/Si tandem cell exhibited a much higher power-conversion efficiency (PCE) of 17.2% compared to the stand-alone SJ devices of DSSCs (-11.4%) or Si (-12.3%) cells. The PCE of the best tandem cell is 18.1%. To the best of our knowledge, our tandem cell has a record-high PCE among all tandem cells involving DSSCs and also the highest improvement of PCE among all tandem cells based on dissimilar photovoltaic materials. The 2-terminal DSSC/Si tandem solar cells exhibit a high V-oc value of 1.36 V. The DSSC/Si tandem solar cells are externally connected to a Pt electro-catalyst for use as water splitting cells. Solar-to-hydrogen conversion was accomplished at 0.65 V vs. Pt bias. We expect that a tandem architecture based on organic-inorganic hybrid materials can provide a promising way to realize low-cost and high-efficiency photovoltaic devices for solar cells and hydrogen generation.
Keywords
SILICON; ELECTRODE; GRAPHENE; POLYMER; CIGS; SILICON; ELECTRODE; GRAPHENE; POLYMER; CIGS; Tandem solar cells; DSSC; crystalline silicon solar cells
ISSN
1754-5692
URI
https://pubs.kist.re.kr/handle/201004/123406
DOI
10.1039/c6ee02296k
Appears in Collections:
KIST Article > 2016
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