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Science 14 Sep 2018:
Vol. 361, Issue 6407, pp. 1094-1098
DOI: 10.1126/science.aat2612
Tailoring tandem organics
Tandem solar cells can boost efficiency by using a wider range of the solar spectrum. The bandgap of organic semiconductors can be tuned over a wide range, but, for a two-terminal device that directly connects the cells, the currents produced must be nearly equal. Meng et al.used a semiempirical analysis to choose well-matched top- and bottom-cell active layers. They used solution processing to fabricate an inverted tandem device that has a power conversion efficiency as high as 17.4%.
Science, this issue p. 1094