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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

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

Detail(s)

Original languageEnglish
Article number2000772
Journal / PublicationAdvanced Energy Materials
Publication statusOnline published - 15 Jun 2020
Externally publishedYes

Abstract

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.

Research Area(s)

  • hydrogen generation, perovskite solar cells, photoelectrochemical cell, Si photoelectrodes, stand-alone water splitting

Citation Format(s)

Over 17% Efficiency Stand‐Alone Solar Water Splitting Enabled by Perovskite‐Silicon Tandem Absorbers. / Karuturi, Siva Krishna; Shen, Heping; Sharma, Astha; Beck, Fiona J.; Varadhan, Purushothaman; Duong, The; Narangari, Parvathala Reddy; Zhang, Doudou; Wan, Yimao; He, Jr-Hau; Tan, Hark Hoe; Jagadish, Chennupati; Catchpole, Kylie.

In: Advanced Energy Materials, 15.06.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal