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  - Wolff, Christian Michael
A1  - Zu, Fengshuo
A1  - Paulke, Andreas
A1  - Perdigon-Toro, Lorena
A1  - Koch, Norbert
A1  - Neher, Dieter
T1  - Reduced Interface-Mediated Recombination for High Open-Circuit Voltages in CH3NH3PbI3 Solar Cells
JF  - Advanced materials
N2  - Perovskite solar cells with all-organic transport layers exhibit efficiencies rivaling their counterparts that employ inorganic transport layers, while avoiding high-temperature processing. Herein, it is investigated how the choice of the fullerene derivative employed in the electron-transporting layer of inverted perovskite cells affects the open-circuit voltage (V-OC). It is shown that nonradiative recombination mediated by the electron-transporting layer is the limiting factor for the V-OC in the cells. By inserting an ultrathin layer of an insulating polymer between the active CH3NH3PbI3 perovskite and the fullerene, an external radiative efficiency of up to 0.3%, a V-OC as high as 1.16 V, and a power conversion efficiency of 19.4% are realized. The results show that the reduction of nonradiative recombination due to charge-blocking at the perovskite/organic interface is more important than proper level alignment in the search for ideal selective contacts toward high V-OC and efficiency.
KW  - electron-transport layers
KW  - nonradiative recombination
KW  - open-circuit voltage
KW  - perovskite solar cells
Y1  - 2017
U6  - https://doi.org/10.1002/adma.201700159
SN  - 0935-9648
SN  - 1521-4095
VL  - 29
PB  - Wiley-VCH
CY  - Weinheim
ER  -