Journal
MATTER
Volume 6, Issue 11, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.matt.2023.09.006
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This study demonstrates the efficient synthesis of a new semiconducting polymer (p-O5H-E-POZ-E) through direct arylation polycondensation, which is then used in the hole transport layer of perovskite solar cells, achieving high efficiency and thermal stability.
The relentless pursuit of higher efficiencies in perovskite solar cells relies on the use of spiro-OMeTAD as a hole transport material, re-sulting in an impressive efficiency record of 25.7%. However, these high-efficiency cells have proven vulnerable to harsh heat conditions at 85 degrees C. Here, we employed direct arylation polycondensation to efficiently synthesize a semiconducting polymer (p-O5H-E-POZ-E), the main chain of which consists of a strategic alternation of oxa[5] helicene, 3,4-ethylenedioxythiophene, phenoxazine, and 3,4-ethyl-enedioxythiophene. The air-doped composite of p-O5H-E-POZ-E and lithium bis(trifluoromethanesulfonyl)imide exhibits a room tem-perature conductivity of 75 mS cm( -1) and an exceptional glass -transi-tion temperature of 187 degrees C. Compared to spiro-OMeTAD, p-O5H-E-POZ-E demonstrates a comparable highest occupied molecular orbital energy level for efficient hole extraction while exhibiting enhanced elastic modulus and fracture strength and reduced water permeation in its composite film. Using p-O5H-E-POZ-E in the hole transport layer, we demonstrate perovskite solar cells with an average efficiency of 24.9% and thermostability at 85 degrees C.
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