Quantification of Quantum Efficiency and Energy Losses in Low Bandgap Polymer:Fullerene Solar Cells with High Open-Circuit Voltage

2012 ◽  
Vol 22 (16) ◽  
pp. 3480-3490 ◽  
Author(s):  
Koen Vandewal ◽  
Zaifei Ma ◽  
Jonas Bergqvist ◽  
Zheng Tang ◽  
Ergang Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Efficiency ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Energy Losses ◽  
Low Bandgap

Microcrystalline (Si,Ge):H Solar Cells

2003 ◽  
Vol 762 ◽  
Author(s):  
Jianhua Zhu ◽  
Vikram L. Dalal
Keyword(s):  
Solar Cells ◽  
Buffer Layer ◽  
Quantum Efficiency ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Defect Density ◽  
Cell Structure ◽  
Open Circuit ◽  
Base Layer ◽  
Ecr Plasma

AbstractWe report on the growth and properties of microcrystalline Si:H and (Si,Ge):H solar cells on stainless steel substrates. The solar cells were grown using a remote, low pressure ECR plasma system. In order to crystallize (Si,Ge), much higher hydrogen dilution (∼40:1) had to be used compared to the case for mc-Si:H, where a dilution of 10:1 was adequate for crystallization. The solar cell structure was of the p+nn+ type, with light entering the p+ layer. It was found that it was advantageous to use a thin a-Si:H buffer layer at the back of the cells in order to reduce shunt density and improve the performance of the cells. A graded gap buffer layer was used at the p+n interface so as to improve the open-circuit voltage and fill factor. The open circuit voltage and fill factor decreased as the Ge content increased. Quantum efficiency measurements indicated that the device was indeed microcrystalline and followed the absorption characteristics of crystalline ( Si,Ge). As the Ge content increased, quantum efficiency in the infrared increased. X-ray measurements of films indicated grain sizes of ∼ 10nm. EDAX measurements were used to measure the Ge content in the films and devices. Capacitance measurements at low frequencies ( ~100 Hz and 1 kHz) indicated that the base layer was indeed behaving as a crystalline material, with classical C(V) curves. The defect density varied between 1x1016 to 2x1017/cm3, with higher defects indicated as the Ge concentration increased.

Efficient large guanidinium mixed perovskite solar cells with enhanced photovoltage and low energy losses

2019 ◽  
Vol 55 (30) ◽  
pp. 4315-4318 ◽  
Author(s):  
Shengfan Wu ◽  
Zhen Li ◽  
Jie Zhang ◽  
Tiantian Liu ◽  
Zonglong Zhu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Power Conversion Efficiency ◽  
Conversion Efficiency ◽  
Open Circuit Voltage ◽  
Power Conversion ◽  
Perovskite Solar Cells ◽  
Open Circuit ◽  
Low Energy ◽  
Energy Losses ◽  
Perovskite Lattice

We present a strategy for suppressing the open-circuit voltage (Voc) loss of perovskite solar cells by incorporating large guanidinium cations (Gua+) into a perovskite lattice, leading to a significantly improved Voc of 1.19 V and an impressive power conversion efficiency of >21%.

Reduced open-circuit voltage loss for highly efficient low-bandgap perovskite solar cells via suppression of silver diffusion

2019 ◽  
Vol 7 (29) ◽  
pp. 17324-17333 ◽  
Author(s):  
Meiyue Liu ◽  
Ziming Chen ◽  
Yongchao Yang ◽  
Hin-Lap Yip ◽  
Yong Cao
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Energy Level ◽  
Open Circuit Voltage ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Open Circuit ◽  
Perovskite Layer ◽  
Low Bandgap ◽  
Voltage Loss

Ag diffused across the PCBM layer increased the trap density and down-shifted the energy level of the perovskite layer. Fortunately, PCBM/ZnO layer efficiently suppressed the Ag diffusion, resulting in a perovskite solar cell with PCE of 18.1%.

scholarly journals Features of model thin-film solar cells photoelectric characteristics based on a non-toxic multi-component connection CuZn2AlS4

2021 ◽  
Vol 5 (3) ◽  
pp. 242-250
Author(s):  
D. Sergeyev ◽  
K. Shunkeyev ◽  
B. Kuatov ◽  
N. Zhanturina
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Quantum Efficiency ◽  
Fill Factor ◽  
Open Circuit Voltage ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Open Circuit ◽  
Thin Film Solar Cells ◽  
Current Voltage

In this paper, the features of the characteristics of model thin-film solar cells based on the non-toxic multicomponent compound CuZn2AlS4 (CZAS) are considered. The main parameters (open-circuit voltage, short-circuit current, fill factor, efficiency) and characteristics (quantum efficiency, current-voltage characteristic) of thin-film solar cells based on CZAS have been determined. The minimum optimal thickness of the CZAS absorber is found (1-1.25 microns). Deterioration of the performance of solar cells with an increase in operating temperature (280-400 K) is shown. It is revealed that in the wavelength range of 390-500 nm CZAS has a high external quantum efficiency, which allows its use in designs of multi-junction solar cells designed to absorb solar radiation in the specified range. It is shown that the combination of CZAS films with a buffer layer of non-toxic ZnS increases the performance of solar cells.

Open-Circuit Voltage Limitation in Low-Bandgap Diketopyrrolopyrrole-Based Polymer Solar Cells Processed from Different Solvents

2011 ◽  
Vol 115 (30) ◽  
pp. 15075-15080 ◽  
Author(s):  
Pablo P. Boix ◽  
Martijn M. Wienk ◽  
René A. J. Janssen ◽  
Germà Garcia-Belmonte
Keyword(s):  
Solar Cells ◽  
Open Circuit Voltage ◽  
Polymer Solar Cells ◽  
Open Circuit ◽  
Low Bandgap

Reducing non-radiative recombination energy loss via a fluorescence intensifier for efficient and stable ternary organic solar cells

2021 ◽  
Author(s):  
Xuan Liu ◽  
Yang Liu ◽  
Yongfeng Ni ◽  
Ping Fu ◽  
Xuchao Wang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Quantum Efficiency ◽  
Organic Solar Cells ◽  
Radiative Recombination ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Effective Strategy ◽  
Recombination Energy ◽  
Photoactive Layer

Increasing electroluminescene quantum efficiency (EQEEL) of photoactive layer to reduce non-radiative recombination energy loss (Eloss) has been demonstrated an effective strategy to improve open-circuit voltage (Voc) of organic solar cells...

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