Table 1 The optical properties and electronic energy levels of M1, M2, PC61BM and PC61MBA

From: Hydrogen bonding in bulk heterojunction solar cells: A case study

Small molecule

UV-vis λmax (nm)a

UV-vis λonset (nm)a

PL λmax (nm)b

Optical gap (eV)c

EHOMO (eV)d

ELUMO (eV)

M1

510 (640)

604 (693)

665 (726)

1.79

−5.09

−3.30e

M2

500 (560)

590 (675)

640 (710)

1.84

−5.01

−3.17e

PC61BM

328 (336)

—

—

—

−5.76

−3.84d

PC61MBA

328 (335)

—

—

—

−5.74

−3.80d

  1. aUV-vis absorption data in chloroform solution and solid films in brackets.
  2. bphotoluminescence (PL) data in chloroform solution and solid films in brackets.
  3. ccalculated from thin film absorption onset.
  4. dMeasured using CV.
  5. ecalculated from HOMO and the optical gap.
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