Kwon, Jeong Im, Min Ji Kim, Chan Ul Won, Sang Hyuk Kang, Sung Bum Kang, Sung Ho Choi, In Taek Kim, Hwan Kyu Kim, In Ho Park, Jong Hyeok Choi, Kyoung Jin 2024-01-20T03:00:47Z 2024-01-20T03:00:47Z 2021-09-03 2016-12 1754-5692 https://pubs.kist.re.kr/handle/201004/123406 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. English Royal Society of Chemistry SILICON ELECTRODE GRAPHENE POLYMER CIGS Two-terminal DSSC/silicon tandem solar cells exceeding 18% efficiency Article 10.1039/c6ee02296k 1 Energy & Environmental Science, v.9, no.12, pp.3657 - 3665 Energy & Environmental Science 9 12 3657 3665 scie scopus 000392915500005 2-s2.0-85002664897 Chemistry, Multidisciplinary Energy & Fuels Engineering, Chemical Environmental Sciences Chemistry Energy & Fuels Engineering Environmental Sciences & Ecology Article SILICON ELECTRODE GRAPHENE POLYMER CIGS Tandem solar cells DSSC crystalline silicon solar cells