Near field control for enhanced photovoltaic performance and photostability in perovskite solar cells

Mohammad Ismail Hossain, Md Shahiduzzaman, Safayet Ahmed, Md Rashedul Huqe, Wayesh Qarony, Ahmed Mortuza Saleque, Md Akhtaruzzaman, Dietmar Knipp, Yuen Hong Tsang, Tetsuya Taima, Juan Antonio Zapien

Research output: Journal article publicationJournal articleAcademic researchpeer-review

28 Citations (Scopus)


We present a strategy for photon management in front contact of perovskite solar cells (PSCs) compatible with tandem and flexible PSCs capable of optimizing device characteristics while providing an additional mechanism to overcome excessive focusing that affects the device's photostability. Rigorous validation of the numerical modeling used was performed by fabricating PSCs in a superstrate configuration optimized to reach high performance, ECE = 17.4%, VOC = 1.02 V, JSC = 22.3 mA/cm2, and FF = 77%. These 3D electromagnetic simulations combining the finite-difference time-domain (FDTD) and finite element method (FEM) techniques provide detailed insights of the photonic and electrical effects in PSCs. Numerical optimization of the dual capabilities of a novel nanostructured front contact enables control of the absorbed power density distribution to maximize efficiency while simultaneously minimizing nanostructure-related sub-wavelength focusing effects. In-depth analysis of the proposed photon management reveals enhanced electrical characteristics to maximize charge extraction leading to JSC enhancements of ~15 that can be as high as 33% for ultra-thin active layers suitable for flexible PSCs compared to planar PSCs performance. Furthermore, we show that the design of the front contact layer's nanostructure enables control of the power density distribution in the device to engineer PSCs' photostability without compromising performance enhancements afforded by the nanophotonic front contact. Details of the nanophotonic front contact, device, and fabrication process are provided.

Original languageEnglish
Article number106388
JournalNano Energy
Publication statusPublished - Nov 2021


  • FDTD and FEM techniques
  • Metal-oxide
  • Nanostructured front contact
  • Perovskite solar cells
  • Photostability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Materials Science
  • Electrical and Electronic Engineering


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