Optical : In situ monitoring during the synthesis of halide perovskite solar cells reveals formation kinetics and evolution of optoelectronic properties

Suchan, Klara (författare): Lund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Helmholtz Association of German Research Centers

Just, Justus (författare): Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory,Helmholtz Association of German Research Centers

Becker, Pascal (författare): Helmholtz Association of German Research Centers

Unger, Eva L. (författare): Lund University,Lunds universitet,NanoLund: Centre for Nanoscience,Annan verksamhet, LTH,Lunds Tekniska Högskola,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Other operations, LTH,Faculty of Engineering, LTH,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH,Helmholtz Association of German Research Centers

Unold, Thomas (författare): Helmholtz Association of German Research Centers

(creator_code:org_t)

2020
2020
Engelska 11 s.
Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7488 .- 2050-7496. ; 8:20, s. 10439-10449

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Abstract Ämnesord

Stäng

The formation mechanism and the evolution of optoelectronic properties during annealing of chlorine-derived methylammonium lead iodide (MAPbI3-xClx) are investigated in detail combining in situ and ex situ optical and structural characterization. Using in situ optical reflectometry we are able to monitor the evolution of the MAPbI3-xClx phase as a function of time and processing temperature. The formation kinetics is fitted using an improved Johnson-Mehl-Avrami-Kolmogorov model and a delayed formation of MAPbI3-xClx is found when chlorine is present in the precursor. This is verified by X-ray diffraction and X-ray fluorescence measurements. From absolute photoluminescence measurements we determine the implied Voc during film formation, which exhibits a maximum at a specific time during the annealing process. In conjunction with ex situ time-resolved photoluminescence we deduce a decrease in the net doping density for increased annealing times, while the minority carrier lifetime stays constant. We thus demonstrate the potential of in situ optical spectroscopy to monitor and tailor the electronic properties of hybrid perovskites directly during film growth, which can be easily applied to different growth recipes and synthesis environments.

Av författaren/redakt...: Suchan, Klara; Just, Justus; Becker, Pascal; Unger, Eva L.; Unold, Thomas

Om ämnet

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