TY - JOUR
T1 - Optical simulations to inform the design of UV-absorbing organic materials and solar cells
AU - Burlingame, Quinn
AU - Loo, Yueh Lin
N1 - Funding Information:
Q.C.B. thanks the Arnold and Mabel Beckman Foundation for Funding this work. Q.C.B. and Y.-L.L. thank the National Science Foundation Division of Materials Research for their support under award DMR- 1420541 .
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/8/1
Y1 - 2021/8/1
N2 - Organic solar cells are ideal for semi-transparent applications given their “peaky” absorption, which allows them to selectively absorb photons outside the visible range while transmitting visible light. Such devices embody a fundamental tradeoff between transparency and power generation that must be optimized to fit the requirements of each potential application—for example, powering electrically dimmable smart windows. To inform the design of organic ultraviolet-absorbers and solar cells that target such applications, we computer-generate sets of optical constants with a range of absorption coefficients and absorption cutoff wavelengths that mimic those of real organic semiconductors. We then perform optical transfer-matrix simulations to determine the absorption and transmission spectra of full-stack photovoltaic cells, inserting these computer-generated optical constants to describe the photoactive absorbing layers. We find that solar cells having absorbers with a cutoff wavelength of 420 nm produce the most power without degrading transparency or color neutrality, and that absorption coefficients up to 5 × 105 cm−1 are needed to fully absorb the targeted wavelengths within practical photoactive layer thicknesses <300 nm in the absence of a reflecting electrode.
AB - Organic solar cells are ideal for semi-transparent applications given their “peaky” absorption, which allows them to selectively absorb photons outside the visible range while transmitting visible light. Such devices embody a fundamental tradeoff between transparency and power generation that must be optimized to fit the requirements of each potential application—for example, powering electrically dimmable smart windows. To inform the design of organic ultraviolet-absorbers and solar cells that target such applications, we computer-generate sets of optical constants with a range of absorption coefficients and absorption cutoff wavelengths that mimic those of real organic semiconductors. We then perform optical transfer-matrix simulations to determine the absorption and transmission spectra of full-stack photovoltaic cells, inserting these computer-generated optical constants to describe the photoactive absorbing layers. We find that solar cells having absorbers with a cutoff wavelength of 420 nm produce the most power without degrading transparency or color neutrality, and that absorption coefficients up to 5 × 105 cm−1 are needed to fully absorb the targeted wavelengths within practical photoactive layer thicknesses <300 nm in the absence of a reflecting electrode.
KW - High-voltage photovoltaics
KW - Optical simulations
KW - Organic photovoltaics
KW - Transfer-matrix simulations
KW - Transparent photovoltaics
KW - UV-Absorbing photovoltaics
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U2 - 10.1016/j.solmat.2021.111114
DO - 10.1016/j.solmat.2021.111114
M3 - Article
AN - SCOPUS:85104421009
SN - 0927-0248
VL - 227
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
M1 - 111114
ER -