TY - JOUR
T1 - Comparing the Calculated Fermi Level Splitting with the Open-Circuit Voltage in Various Perovskite Cells
AU - Guo, Dengyang
AU - Caselli, Valentina M.
AU - Hutter, Eline M.
AU - Savenije, Tom J.
PY - 2019
Y1 - 2019
N2 -
While the power conversion efficiency of metal halide perovskite (MHP) solar cells has increased enormously, the open-circuit voltage, V
oc
, is still below the conceivable limit. Here, we derive the Fermi level splitting, μ
F
, for various types of noncontacted MHPs, which sets a limit for their achievable V
oc
, using rate constants and mobilities obtained from time-resolved photoconductivity measurements. Interestingly, we find that for vacuum-evaporated MAPbI
3
and K
+
-doped (MA,FA,Cs)Pb(I/Br)
3
, the μ
F
/e values are close to the reported V
oc
values. This implies that for an improvement of the V
oc
, charge carrier recombination within the bare perovskite has to be reduced. On the other hand, for MHPs with Cs
+
and/or Rb
+
addition, the experimental V
oc
is still below μ
F
/e, suggesting that higher voltages are feasible by optimizing the transport layers. The presented approach will help to select which techniques and transport layers are beneficial to improve the efficiency of MHP solar cells.
AB -
While the power conversion efficiency of metal halide perovskite (MHP) solar cells has increased enormously, the open-circuit voltage, V
oc
, is still below the conceivable limit. Here, we derive the Fermi level splitting, μ
F
, for various types of noncontacted MHPs, which sets a limit for their achievable V
oc
, using rate constants and mobilities obtained from time-resolved photoconductivity measurements. Interestingly, we find that for vacuum-evaporated MAPbI
3
and K
+
-doped (MA,FA,Cs)Pb(I/Br)
3
, the μ
F
/e values are close to the reported V
oc
values. This implies that for an improvement of the V
oc
, charge carrier recombination within the bare perovskite has to be reduced. On the other hand, for MHPs with Cs
+
and/or Rb
+
addition, the experimental V
oc
is still below μ
F
/e, suggesting that higher voltages are feasible by optimizing the transport layers. The presented approach will help to select which techniques and transport layers are beneficial to improve the efficiency of MHP solar cells.
UR - http://www.scopus.com/inward/record.url?scp=85063446221&partnerID=8YFLogxK
U2 - 10.1021/acsenergylett.9b00431
DO - 10.1021/acsenergylett.9b00431
M3 - Article
AN - SCOPUS:85063446221
SN - 2380-8195
VL - 4
SP - 855
EP - 860
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 4
ER -