Organic Solar Cells with an Efficiency Approaching 15%
Yong Cui a, Jianhui Hou b
a Institute of Chemistry, Chinese Academy of Sciences (ICCAS), China
b Institute of Chemistry, Chinese Academy of Sciences (ICCAS), China
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Benidorm, Spain, 2018 May 28th - 31st
Organizers: Emilio Palomares and Rene Janssen
Poster, Jianhui Hou, 289
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.

© FUNDACIO DE LA COMUNITAT VALENCIANA SCITO
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info