Optical constants

Refractive index of PBDB-T:ITIC

Kerremans et al. 2020: n,k 0.37–1.6 µm

Data: tabulated n + tabulated k
Range: 0.3733–1.605 µm
Points: 119
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength. Note: k data cover 377.1-1600 nm only; k = 0 elsewhere in the n range 373.3-1604.5 nm.

At one wavelength

Refractive index n: 1.52584
Extinction coefficient k: 0.921544

Permittivity ε₁: 1.47894
Permittivity ε₂: 2.81226

Absorption coefficient α: 197081 cm⁻¹
Penetration depth δ = λ/(2πk): 101.481 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: 5.74454 µm⁻¹

Group index n_g: -1.84965
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 2.11001 eV

ε = (n + ik)², α = 4πk/λ, n_g = n − λ dn/dλ, GVD = λ³/(2πc²) d²n/dλ², D = −(λ/c) d²n/dλ². Group-velocity dispersion is given for formula data only.

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# PBDB-T:ITIC: Kerremans et al. 2020: n,k 0.37–1.6 µm
pbdbt_itic = ls.fetch_refractiveindex("other", "PBDBT-ITIC", "Kerremans", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(pbdbt_itic.range_nm)  # (373.3, 1604.5) nm
eps = pbdbt_itic.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_a31afcd7dc12/lightsmith"
pbdbt_itic = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(pbdbt_itic.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (pbdbt-itic/kerremans-2020).

# ... load pbdbt_itic as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=pbdbt_itic)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

Comments and conditions

PBDB-T:ITIC (1:1) thin film.

Notes on the source data (kept exactly as published):

k < 0 at some wavelengths in the source data (gain, or a sign convention issue)
k data cover 377.1-1600 nm only; k = 0 elsewhere in the n range 373.3-1604.5 nm

References

R Kerremans, C. Kaiser, W. Li, N. Zarrabi, P. Meredith, A. Armin. The optical constants of solution-processed semiconductors—new challenges with perovskites and non-fullerene acceptors. Adv. Opt. Mater. 8, 2000319 (2020) (Data points extracted from Figure 4, PBDB-T:ITIC, Ellipsometry)

doi:10.1002/adom.202000319 The Optical Constants of Solution‐Processed Semiconductors—New Challenges with Perovskites and Non‐Fullerene Acceptors, Advanced Optical Materials (2020)

Cite

Robin Kerremans et al.. The Optical Constants of Solution‐Processed Semiconductors—New Challenges with Perovskites and Non‐Fullerene Acceptors. Advanced Optical Materials, 8, 2000319 (2020), doi:10.1002/adom.202000319; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 119 wavelengths, the same grid as the API and the library

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

PBDB-T:ITIC, Kerremans et al. 2020: n,k 0.37–1.6 µm: n and k versus wavelength
λ (µm)	n	k
0.3733	1.62627	0
0.3944	1.60633	0.2756626
0.4183	1.57215	0.2742776
0.4367	1.55222	0.2756295
0.4514	1.51804	0.2802151
0.468	1.48386	0.290478
0.48	1.44968	0.3088047
0.4937	1.40981	0.3434245
0.5057	1.37563	0.3859091
0.5232	1.33291	0.4961898
0.5305	1.32437	0.544003
0.548	1.34715	0.6767465
0.5691	1.41835	0.8281835
0.5793	1.47816	0.8910005
0.5912	1.54652	0.9341898
0.6078	1.61487	0.9869074
0.6179	1.67184	1.037798
0.6262	1.74019	1.107121
0.6308	1.78006	1.13495
0.6363	1.84272	1.147469
0.639	1.89968	1.150734
0.6436	1.96804	1.143016
0.6482	2.0193	1.126869
0.651	2.05063	1.109631
0.6547	2.09905	1.071873
0.6639	2.14177	0.9869033
0.6731	2.12468	0.9243569
0.685	2.09051	0.9616144
0.6924	2.09335	1.037706
0.6979	2.15601	1.100266
0.7016	2.20158	1.136156
0.7052	2.26424	1.15365
0.708	2.29842	1.16101
0.7098	2.34399	1.162945
0.7126	2.38956	1.156379
0.7144	2.45222	1.150765
0.7181	2.49209	1.136254
0.7209	2.52057	1.115966
0.7236	2.56044	1.073966
0.7255	2.60601	1.052546
0.7301	2.64019	0.97392
0.7365	2.69146	0.85226
0.7402	2.71994	0.72351
0.7494	2.75411	0.4324893
0.7567	2.76266	0.21881
0.7641	2.74272	0.07490852
0.7696	2.71424	0.01153556
0.7733	2.68576	-0.01672712
0.7788	2.65158	-0.02975978
0.7816	2.62025	-0.03332286
0.7852	2.58323	-0.03790396
0.7898	2.5519	-0.04077478
0.7935	2.52057	-0.04180435
0.8018	2.47785	-0.04335284
0.8064	2.45222	-0.04171541
0.8137	2.42373	-0.03863446
0.8183	2.40095	-0.03598832
0.8285	2.36677	-0.02822121
0.834	2.34684	-0.02445168
0.8441	2.3212	-0.018794
0.8551	2.29557	-0.01421727
0.8652	2.26994	-0.01257918
0.8754	2.2557	-0.009335246
0.8855	2.23576	-0.006159844
0.9002	2.21297	-0.0006831818
0.9075	2.20728	0.002750976
0.9204	2.18734	0.002766707
0.9333	2.1731	0.00413
0.9443	2.16456	0.00278
0.9572	2.15601	0.0008990411
0.9701	2.14462	0.001564452
0.9885	2.12753	0.002877755
1.0032	2.11614	0.002901918
1.0124	2.11044	0.002916
1.0252	2.10759	0.002939273
1.0381	2.09905	0.002961676
1.0482	2.08766	0.002977681
1.0583	2.08766	0.002991951
1.0731	2.07627	0.00301
1.0878	2.07627	0.004972701
1.0988	2.06772	0.004988341
1.1117	2.06487	0.003835613
1.1227	2.06203	0.001202623
1.1347	2.05633	0.00376
1.1503	2.04778	0.003896859
1.1632	2.04494	0.003962683
1.1724	2.04494	0.005062195
1.1834	2.03639	0.003946437
1.1944	2.03639	0.003206885
1.2091	2.0307	0.003301273
1.2183	2.0307	0.004394121
1.2349	2.0307	0.00520811
1.2496	2.02215	0.003499344
1.2643	2.025	0.001830846
1.2772	2.01646	0.003095174
1.2937	2.01361	0.003368912
1.3066	2.01361	0.003210937
1.3177	2.00791	0.001554609
1.3342	2.01076	0.003380606
1.3489	2.00222	0.00503954
1.3636	2.00222	0.003982903
1.3765	2.00222	0.003502109
1.3931	1.99652	0.00225878
1.4032	1.99937	0.0021725
1.4151	1.99082	0.003467317
1.4243	1.99082	0.002401463
1.4335	1.99082	0.002447246
1.4501	1.98513	0.005551144
1.4648	1.98513	0.005556707
1.4795	1.98513	0.003844695
1.4905	1.98513	0.004798485
1.5071	1.98513	0.005644015
1.5181	1.98228	0.005663269
1.5273	1.97943	0.005680645
1.5429	1.97658	0.005700816
1.5567	1.97943	0.005719592
1.5696	1.97658	0.005744727
1.5834	1.97658	0.005769818
1.6045	1.96804	0

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

PBDB-T:ITIC: all datasets

Kerremans et al. 2020: n,k 0.37–1.6 µm n,k 0.3733–1.605 µm default

About PBDB-T:ITIC

Applications: Solar cells PBDB-T chemical composition: (C₆₈H₇₈O₂S₈)_n ITIC chemical composition: C₉₄H₈₂N₄O₂S₄

More about PBDB-T:ITIC →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/other/mixed organic/PBDBT-ITIC/nk/Kerremans.yml
ID: ds_a31afcd7dc12
API: /v1/datasets/ds_a31afcd7dc12

Plot