Efficient Double- and Triple-Junction Nonfullerene Organic Photovoltaics and Design Guidelines for Optimal Cell Performance

Yuliar Firdaus, Carr Hoi Yi Ho, Yuanbao Lin, Emre Yengel, Vincent M. Le Corre, Mohamad Insan Nugraha, Emre Yarali, Franky So, Thomas D. Anthopoulos

Research output: Contribution to journalArticlepeer-review

Abstract

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 × 10–4 cm2 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.
Original languageEnglish (US)
Pages (from-to)3692-3701
Number of pages10
JournalACS Energy Letters
DOIs
StatePublished - Nov 12 2020

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