Efficiency enhancement by changing perovskite crystal phase and adding a charge extraction interlayer in organic amine free-perovskite solar cells based on cesium

Improvements of overall photoconversion efficiencies under simulated 1sun illumination are reported for inorganic perovskite solar cells based on cesium lead halide, CsPbI3, as perovskite absorber material. By modifying the perovskite crystal structure and inserting a particular hole extraction inte...

Full description

Saved in:
Bibliographic Details
Published in:Solar energy materials and solar cells 2016-01, Vol.144, p.532-536
Main Authors: Ripolles, Teresa S., Nishinaka, Koji, Ogomi, Yuhei, Miyata, Youhei, Hayase, Shuzi
Format: Article
Language:English
Subjects:
Cesium
Charge
Extraction
Free-organometal halide
Hysteresis
Interlayers
Molybdenum trioxide
Perovskite
Perovskites
Photovoltaic cells
Solar cell
Solar cells
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Improvements of overall photoconversion efficiencies under simulated 1sun illumination are reported for inorganic perovskite solar cells based on cesium lead halide, CsPbI3, as perovskite absorber material. By modifying the perovskite crystal structure and inserting a particular hole extraction interlayer, a remarkable efficiency enhancement is achieved from 0.09% that was reported previously to 4.68%. Additionally, we demonstrated that the nature of the perovskite crystallinity as well as the charge extraction material play a decisive role in the establishment of the degree of hysteresis. Particularly, fundamental analysis verified that upon the existence of MoO3 layer as a hole extraction interlayer, the I–V hysteresis effect was suppressed. Therefore, this model proposes that the hysteresis is also originated by the interface phenomena and not only by the perovskite film or the structure of the solar cell, mesoporous and planar, effects as have been reported. Our experimental observation suggests that the morphology of the perovskite film in addition to selective interface cathode electrode play a critical role for recording an enhancement of photoconversion efficiencies in perovskite solar cells. •All-inorganic solar cells achieved high photoconvertion efficiencies, over 4%.•The proper crystal structure of CsPbI3 is the cubic crystal phase achieved at 350°C.•The I–V hysteresis behavior is controlled by the nature of the hole transport material.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2015.09.041