All-inorganic CsPbBr3 perovskite solar cells (PSCs) without hole-transport materials (HTMs) have attracted widespread attention because of their significant environmental stability. However, the poor quality of perovskite film and the energetics...
The incorporation of an inorganic hole transport material
(HTM)
with high hole mobility and matched energetics at the back interface
of perovskite/carbon plays a major role in improving the power conversion
efficiency (PCE) and stability of perovskite solar cells (PSCs). Here,
M3+ (M = Sc, Y, and La)-doped CuAlO2, CuAl(M)O2, with superior p-type conductivity and suitable energy band
is inserted between the CsPbBr3 perovskite layer and carbon
electrode as an efficient HTM to enhance hole extraction and reduce
energy loss within carbon-based CsPbBr3 PSCs. The balance
between the increased interstitial oxygen concentration and the carrier
scattering caused by the lattice distortion of CuAl(M)O2 endows a higher hole mobility of CuAl(Sc)O2, giving a
substantially increased PCE of 10.13% of the CuAl(Sc)O2 tailored CsPbBr3 PSCs, compared with the 6.5% efficiency
of the device without HTMs. Moreover, the CuAl(Sc)O2-based
CsPbBr3 PSCs without packaging still have 90% of the original
efficiency after being stored for 720 h in an air environment with
a relative humidity of 85% at 85 °C, exhibiting an outstanding
long-term humidity-thermal tolerance.
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