Determination of subcell open circuit voltages and Iph–Voc curves in multijunction solar cells by sequentially pulsed, monochromatic illumination

2016 ◽  
Vol 108 (25) ◽  
pp. 253902 ◽  
Author(s):  
M. Rutzinger ◽  
H. Nesswetter ◽  
P. Lugli ◽  
A. W. Bett ◽  
C. G. Zimmermann
Keyword(s):  
Solar Cells ◽  
Open Circuit ◽  
Multijunction Solar Cells ◽  
Open Circuit Voltages ◽  
Monochromatic Illumination

Solar Cell Contacts Using Nano-Sized Dispersions

1999 ◽  
Vol 581 ◽  
Author(s):  
Doug Schulz ◽  
R. Ribelin ◽  
X. Wu ◽  
K.M. Jones ◽  
R.J. Matson ◽  
...  
Keyword(s):  
Solar Cells ◽  
Spray Deposition ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Cdte Layer ◽  
Open Circuit ◽  
Alloy Formation ◽  
Current Densities ◽  
P Type ◽  
Open Circuit Voltages

ABSTRACTNano-sized dispersions have been employed as precursor inks for the spray deposition of contacts to both Si and CdTe materials. In the case of Si, nano-sized Al particles (nano-Al) were dispersed and spray deposited onto p-type Si. Annealing above the eutectic temperature causes alloy formation yielding a p+ layer with p ∼ 10−4 Ω•cm. For CdTe, nano-sized Te particles (nano-Te) were dispersed and sprayed onto CdTe/CdS/SnO2/glass heterostructures. Contact to the CdTe layer occurred during a 30 min anneal in He (T = 215 to 255 °C). These solar cells were finished by spin-coating the Te layer with Ag paint and subsequently annealing in air (100 °C / 1 h). This approach produces solar cells with open circuit voltages (Voc) from 720 to 800 mV, short circuit current densities (Jsc) from 18 to 20 mA/cm2 and efficiencies up to 10.3%. The performance of these cells was similar to those produced using the standard NREL contact.

scholarly journals Analytical Models of Bulk and Quantum Well Solar Cells and Relevance of the Radiative Limit

2012 ◽  
pp. 59-77 ◽  
Author(s):  
James P. Connolly
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Space Charge ◽  
Radiative Recombination ◽  
Light Trapping ◽  
Open Circuit ◽  
Analytical Models ◽  
Injection Currents ◽  
Photon Recycling ◽  
Open Circuit Voltages

The analytical modelling of bulk and quantum well solar cells is reviewed. The analytical approach allows explicit estimates of dominant generation and recombination mechanisms at work in charge neutral and space charge layers of the cells. Consistency of the analysis of cell characteristics in the light and in the dark leaves a single free parameter, which is the mean Shockley-Read-Hall lifetime. Bulk PIN cells are shown to be inherently dominated by non-radiative recombination as a result of the doping related non-radiative fraction of the Shockley injection currents. Quantum well PIN solar cells on the other hand are shown to operate in the radiative limit as a result of the dominance of radiative recombination in the space charge region. These features are exploited using light trapping techniques leading to photon recycling and reduced radiative recombination. The conclusion is that the mirror backed quantum well solar cell device features open circuit voltages determined mainly by the higher bandgap neutral layers, with an absorption threshold determined by the lower gap quantum well superlattice.

scholarly journals The finale of a trilogy: comparing terpolymers and ternary blends with structurally similar backbones for use in organic bulk heterojunction solar cells

2018 ◽  
Vol 6 (39) ◽  
pp. 19190-19200 ◽  
Author(s):  
Mary Allison Kelly ◽  
Qianqian Zhang ◽  
Zhengxing Peng ◽  
Victoria Noman ◽  
Chenhui Zhu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Bulk Heterojunction ◽  
Open Circuit ◽  
Ternary Blends ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells ◽  
Open Circuit Voltages

Comparing the efficiency of terpolymers vs. ternary blends, this study focuses on two polymers with structurally similar backbones (monoCNTAZ and FTAZ) yet markedly different open circuit voltages.

Ladder-type dithienocyclopentadibenzothiophene-cored wide-bandgap polymers for efficient non-fullerene solar cells with large open-circuit voltages

2019 ◽  
Vol 7 (7) ◽  
pp. 3307-3316 ◽  
Author(s):  
Qisheng Tu ◽  
Changquan Tang ◽  
Qingdong Zheng
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
Wide Bandgap ◽  
Open Circuit ◽  
Open Circuit Voltages ◽  
Excellent Stability

Novel wide-bandgap copolymers based on ladder-type dithienocyclopentadibenzothiophene were developed for polymer solar cells with 9.46% efficiency and excellent stability.

scholarly journals Direct nanoscale mapping of open circuit voltages at local back surface fields for PERC solar cells

2020 ◽  
Vol 55 (25) ◽  
pp. 11501-11511
Author(s):  
Alexandra Longacre ◽  
Michael Martin ◽  
Thomas Moran ◽  
Oleg V. Kolosov ◽  
Eric Schneller ◽  
...  
Keyword(s):  
Solar Cells ◽  
Open Circuit ◽  
Back Surface ◽  
Surface Fields ◽  
Open Circuit Voltages

Recombination in Polymer:Fullerene Solar Cells with Open-Circuit Voltages Approaching and Exceeding 1.0 V

2012 ◽  
Vol 3 (2) ◽  
pp. 220-230 ◽  
Author(s):  
Eric T. Hoke ◽  
Koen Vandewal ◽  
Jonathan A. Bartelt ◽  
William R. Mateker ◽  
Jessica D. Douglas ◽  
...  
Keyword(s):  
Solar Cells ◽  
Open Circuit ◽  
Open Circuit Voltages

scholarly journals A Computationally Efficient Multidiode Model for Optimizing the Front Grid of Multijunction Solar Cells under Concentration

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Chris H. van de Stadt ◽  
Pilar Espinet Gonzalez ◽  
Harry A. Atwater ◽  
Rebecca Saive
Keyword(s):  
Solar Cells ◽  
Operating Conditions ◽  
Design Parameters ◽  
Computationally Efficient ◽  
Fast Determination ◽  
Wide Range ◽  
Multijunction Solar Cells ◽  
Efficiency Increase ◽  
Light Concentration

We have developed a computationally efficient simulation model for the optimization of redirecting electrical front contacts for multijunction solar cells under concentration, and we present its validation by comparison with experimental literature results. The model allows for fast determination of the maximum achievable efficiency under a wide range of operating conditions and design parameters such as the contact finger redirecting capability, period and width of the fingers, the light concentration, and the metal and emitter sheet resistivity. At the example of a state-of-the-art four-junction concentrator solar cell, we apply our model to determine ideal operating conditions for front contacts with different light redirection capabilities. We find a 7% relative efficiency increase when enhancing the redirecting capabilities from 0% to 100%.

Sign in / Sign up

Export Citation Format

Share Document