Journal
ACS ENERGY LETTERS
Volume 7, Issue 8, Pages 2477-2485Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.2c01380
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Funding
- International Joint Research Program for Innovative Energy Technology - Ministry of Economy, Trade and Industry of Japan
- Research and Development Program for Promoting Innovative Clean Energy Technologies Through International Collaboration by the New Energy and Industrial Technology Development Organization [JPNP20005]
- Japan Society for the Promotion of Science [16H03824, 19H02534, 15K04687]
- ENEOS Corporation
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We developed an infrared PbS colloidal quantum dot/ZnO nanowire solar cell as a solution-processed bottom solar cell for multijunction solar cells. By constructing spatially separated carrier pathways and thick PbS quantum dot layers, we achieved high infrared light harvesting efficiency. Optical management also played a crucial role in improving the collection efficiency.
We constructed an infrared PbS colloidal quantum dot (QD)/ZnO nanowire (NW) solar cell to develop a solution-processed bottom solar cell for multijunction solar cells. PbS QD/ZnO NW interdigitated structures comprising 1 mu m long ZnO NWs enable the construction of spatially separated carrier pathways and thick PbS QD layers for high infrared light harvesting. Additionally, optical management plays an essential role in the harvesting process. Using infrared transparent conductive oxides as window layers and a wide-band-gap QD electron blocking layer (EBL), the parasitic absorption of the EBL is reduced and the reabsorption of the light reflected is enhanced by the metal back contact. Thus, the developed solar cell produced a short-circuit current density of 39.2 mA/cm(2) under 1 sun illumination and 17.4 mA/cm(2) over an 870 nm infrared region. Furthermore, series-connected spectral splitting solar cells, comprising an InGaP/GaAs top/middle (2J-TM) subcell and the infrared PbS CQD/ZnO NW bottom (1J-B) subcell, yielded a power conversion efficiency of 30.5% under 1 sun illumination.
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