TY  - JOUR
A1  - Jošt, Marko
A1  - Albrecht, Steve
A1  - Kegelmann, Lukas
A1  - Wolff, Christian Michael
A1  - Lang, Felix
A1  - Lipovšek, Benjamin
A1  - Krč, Janez
A1  - Korte, Lars
A1  - Neher, Dieter
A1  - Rech, Bernd
A1  - Topič, Marko
T1  - Efficient light management by textured nanoimprinted layers for perovskite solar cells
JF  - ACS photonics
N2  - Inorganic-organic perovskites like methylammonium-lead-iodide have proven to be an effective class of 17 materials for fabricating efficient solar cells. To improve their performance, light management techniques using textured surfaces, similar to those used in established solar cell technologies, should be considered. Here, we apply a light management foil created by UV nanoimprint lithography on the glass side of an inverted (p-i-n) perovskite solar cell with 16.3% efficiency. The obtained 1 mA cm(-2) increase in the short-circuit current density translates to a relative improvement in cell performance of 5%, which results in a power conversion efficiency of 17.1%. Optical 3D simulations based on experimentally obtained parameters were used to support the experimental findings. A good match between the simulated and experimental data was obtained, validating the model. Optical simulations reveal that the main improvement in device performance is due to a reduction in total reflection and that relative improvement in the short-circuit current density of up to 10% is possible for large-area devices. Therefore, our results present the potential of light management foils for improving the device performance of perovskite solar cells and pave the way for further use of optical simulations in the field of perovskite solar cells.
KW  - perovskite solar cells
KW  - antireflection
KW  - light management
KW  - UV nanoimprint lithography
KW  - optical simulations
Y1  - 2017
U6  - https://doi.org/10.1021/acsphotonics.7b00138
SN  - 2330-4022
VL  - 4
SP  - 1232
EP  - 1239
PB  - American Chemical Society
CY  - Washington
ER  - 
TY  - JOUR
A1  - Braunger, Steffen
A1  - Mundt, Laura E.
A1  - Wolff, Christian Michael
A1  - Mews, Mathias
A1  - Rehermann, Carolin
A1  - Jost, Marko
A1  - Tejada, Alvaro
A1  - Eisenhauer, David
A1  - Becker, Christiane
A1  - Andres Guerra, Jorge
A1  - Unger, Eva
A1  - Korte, Lars
A1  - Neher, Dieter
A1  - Schubert, Martin C.
A1  - Rech, Bernd
A1  - Albrecht, Steve
T1  - Cs(x)FA(1-x)Pb(l(1-y)Br(y))(3) Perovskite Compositions
BT  - the Appearance of Wrinkled Morphology and its Impact on Solar Cell Performance
JF  - The journal of physical chemistry : C, Nanomaterials and interfaces
N2  - We report on the formation of wrinkle-patterned surface morphologies in cesium formamidinium-based Cs(x)FA(1-y)Pb(I1-yBry)(3) perovskite compositions with x = 0-0.3 and y = 0-0.3 under various spin-coating conditions. By varying the Cs and Br contents, the perovskite precursor solution concentration and the spin-coating procedure, the occurrence and characteristics of the wrinkle-shaped morphology can be tailored systematically. Cs(0.17)FA(0.83)Pb(I0.83Br0.17)(3) perovskite layers were analyzed regarding their surface roughness, microscopic structure, local and overall composition, and optoelectronic properties. Application of these films in p-i-n perovskite solar cells (PSCs) with indium-doped tin oxide/NiOx/perovskite/C-60/bathocuproine/Cu architecture resulted in up to 15.3 and 17.0% power conversion efficiency for the flat and wrinkled morphology, respectively. Interestingly, we find slightly red-shifted photoluminescence (PL) peaks for wrinkled areas and we are able to directly correlate surface topography with PL peak mapping. This is attributed to differences in the local grain size, whereas there is no indication for compositional demixing in the films. We show that the perovskite composition, crystallization kinetics, and layer thickness strongly influence the formation of wrinkles which is proposed to be related to the release of compressive strain during perovskite crystallization. Our work helps us to better understand film formation and to further improve the efficiency of PSCs with widely used mixed-perovskite compositions.
Y1  - 2018
U6  - https://doi.org/10.1021/acs.jpcc.8b06459
SN  - 1932-7447
SN  - 1932-7455
VL  - 122
IS  - 30
SP  - 17123
EP  - 17135
PB  - American Chemical Society
CY  - Washington
ER  -