Over 17% Efficiency Stand-Alone Solar Water Splitting Enabled by Perovskite-Silicon Tandem Absorbers

Siva Krishna Karuturi, Heping Shen, Astha Sharma, Fiona J. Beck, Purushothaman Varadhan, The Duong, Parvathala Reddy Narangari, Doudou Zhang, Yimao Wan, Jr-Hau He, Hark Hoe Tan, Chennupati Jagadish, Kylie Catchpole

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57 Scopus citations


Realizing solar-to-hydrogen (STH) efficiencies close to 20% using low-cost semiconductors remains a major step toward accomplishing the practical viability of photoelectrochemical (PEC) hydrogen generation technologies. Dual-absorber tandem cells combining inexpensive semiconductors are a promising strategy to achieve high STH efficiencies at a reasonable cost. Here, a perovskite photovoltaic biased silicon (Si) photoelectrode is demonstrated for highly efficient stand-alone solar water splitting. A p+nn+ -Si/Ti/Pt photocathode is shown to present a remarkable photon-to-current efficiency of 14.1% under biased condition and stability over three days under continuous illumination. Upon pairing with a semitransparent mixed perovskite solar cell of an appropriate bandgap with state-of-the-art performance, an unprecedented 17.6% STH efficiency is achieved for self-driven solar water splitting. Modeling and analysis of the dual-absorber PEC system reveal that further work into replacing the noble-metal catalyst materials with earth-abundant elements and improvement of perovskite fill factor will pave the way for the realization of a low-cost high-efficiency PEC system.
Original languageEnglish (US)
Pages (from-to)2000772
JournalAdvanced Energy Materials
StatePublished - Jun 15 2020


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