Ideal Bandgap Organic–Inorganic Hybrid Perovskite Solar Cells
Abstract
Extremely high power conversion efficiencies (PCEs) of ≈20–22% are realized through intensive research and development of 1.5–1.6 eV bandgap perovskite absorbers. However, development of ideal bandgap (1.3–1.4 eV) absorbers is pivotal to further improve PCE of single junction perovskite solar cells (PVSCs) because of a better balance between absorption loss of sub‐bandgap photons and thermalization loss of above‐bandgap photons as demonstrated by the Shockley–Queisser detailed balanced calculation. Ideal bandgap PVSCs are currently hindered by the poor optoelectronic quality of perovskite absorbers and their PCEs have stagnated at 0.5Sn0.5(I0.8Br0.2)3) is rationally designed and developed, which possesses lower nonradiative recombination states, band edge disorder, and Urbach energy coupled with a higher absorption coefficient, which yields a reduced Voc,loss (0.45 V) and improved PCE (as high as 17.63%) for the derived PVSCs. This work provides a promising platform for unleashing the complete potential of ideal bandgap PVSCs and prospects for further improvement.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 14, 2017
- Source ID
- 10.1002/adma.201704418
Entities
People
- Adharsh Rajagopal
- Alex Jen
- Zhibin Yang
Organizations
- City University of Hong Kong
- National Science Foundation
- Office of Naval Research
- United States Department of Energy
- University of Washington