期刊
ACS ENERGY LETTERS
卷 5, 期 12, 页码 3692-3701出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.0c02077
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资金
- King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR2018-CARF/CCF-3079]
- Office of Naval Research [N00014-17-1-2242]
- National Science Foundation [CBET-1639429]
- NextGen Nano Limited
The performance of multijunction devices lags behind single-junction organic photovoltaics (OPVs) mainly because of the lack of suitable subcells. Here, we attempt to address this bottleneck and demonstrate efficient nonfullerene-based multijunction OPVs while at the same time highlighting the remaining challenges. We first demonstrate double-junction OPVs with power conversion efficiency (PCE) of 16.5%. Going a step further, we developed triple-junction OPVs with a PCE of 14.9%, the highest value reported to date for this triple-junction cells. Device simulations suggest that improving the front-cell's carrier mobility to >5 X 10(-4) cm(2) V-1 s(-1) is needed to boost the efficiency of double- and triple-junction OPVs. Analysis of the efficiency limit of triple-junction devices predicts that PCE values of close to 26% are possible. To achieve this, however, the optical absorption and charge transport within the subcells would need to be optimized. The work is an important step toward next-generation multijunction OPVs.
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