Charge transport layers play an important role in determining the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs). However, it has proven challenging to produce thin and compact charge transport layers via solution processing techniques. Herein, a hot substrate deposition method capable of improving the morphology of high‐coverage hole‐transport layers (HTLs) and electron‐transport layers (ETLs) is reported. PSC devices using HTLs deposited on a hot substrate show improvement in the open‐circuit voltage (V_oc) from 1.041 to 1.070 V and the PCE from 17.00% to 18.01%. The overall device performance is then further enhanced with the hot substrate deposition of ETLs as the V_oc and PCE reach 1.105 V and 19.16%, respectively. The improved performance can be explained by the decreased current leakage and series resistance, which are present in PSCs with rough and discontinuous HTLs and ETLs.

中文翻译：

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空穴和电子传输层的热基板沉积，可增强钙钛矿太阳能电池的性能

电荷传输层在确定钙钛矿太阳能电池（PSC）的功率转换效率（PCE）中起着重要作用。然而，事实证明，通过溶液处理技术生产薄而致密的电荷传输层具有挑战性。本文报道了一种能够改善高覆盖率空穴传输层（HTL）和电子传输层（ETL）形态的热衬底沉积方法。使用沉积在热基板上的HTL的PSC器件的开路电压（V _oc）从1.041改善到1.070 V，PCE从17.00％改善到18.01％。然后，通过热沉积ETL作为V _oc，进一步提高了整个器件的性能。和PCE分别达到1.105 V和19.16％。性能的提高可以通过降低电流泄漏和串联电阻来解释，这在具有粗糙和不连续HTL和ETL的PSC中存在。