Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Tandem structure has the great potential in achieving high photovoltaic efficiency for organic solar cells (OSCs). In tandem OCSs, modulating the spectral response range and reducing the energy loss (Eloss = Eg – e*VOC, where Eg is the optical bandgap, and VOC is the open circuit voltage) of the sub-cells are known as the key steps to improve their photovoltaic performance. In this work, we focus on the fine-tuning of absorption spectra to achieve well-matched light response for the sub-cells of tandem OCSs. we select low-bandgap PTB7-Th:IEICO-4F (1.24 eV) as the rear cell and wide-bandgap J52-2F:IT-M (1.59 eV) as the front cell to fabricate the tandem OCSs. The absorption spectra of PTB7-Th:IEICO-4F is mainly located in the region of 600-950 nm, while that of J52-2F:IT-M is mainly located in the region of 450-750 nm. Both of the two sub-cells show high external quantum efficiencies, and their response spectra are very complementary, realizing high-efficiency utilization of solar spectrum in the range of 300-1000 nm. In this tandem OCS, the Eloss in both front and rear cells are effectively controlled to be 0.64 and 0.53 eV, respectively. In addition, an efficient interconnection layer (ICL) of ZnO/PCP-Na is used to connect the front and rear sub-cells. Based on the fully optimized sub-cells and ICL, the tandem solar cells manufactured in this work possess the advantages of high short-circuit current density (JSC) and VOC, reaching 13.3 mA/cm2 and 1.65 V, respectively. The highest power conversion efficiency (PCE) of the tandem OCS reaches 14.9%. The device parameters decreased slightly after encapsulation due to the intense ultraviolet irradiation, and a certified PCE of 14.0%, with a VOC of 1.64 V, a JSC of 12.9 mA/cm2, and FF of 0.664, is recorded by National Institute of Metrology, China (NIM). This result is the highest one obtained in the organic photovoltaic field.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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